# Latest Slicer Preview Release crashes randomly on macOS Catalina
**URL:** https://discourse.slicer.org/t/latest-slicer-preview-release-crashes-randomly-on-macos-catalina/12759
**Category:** Support
**Created:** [July 28, 2020, 6:42pm UTC](https://discourse.slicer.org/t/latest-slicer-preview-release-crashes-randomly-on-macos-catalina/12759 "2020-07-28T18:42:48Z")
**Posts on this page:** 17
**Page:** 1
### Author:  [@Fernando](https://discourse.slicer.org/u/Fernando)
#### Post date: [July 28, 2020, 6:42pm UTC](https://discourse.slicer.org/t/latest-slicer-preview-release-crashes-randomly-on-macos-catalina/12759/1 "2020-07-28T18:42:48Z")
Unfortunately, I can’t consistently reproduce this, but in the last couple of weeks Slicer has crashed many times. Today it’s happened when playing with the threshold in the `Volumes` module, but I’m not sure it’s related to that. I think the message in the shell is always the same, however, or very similar:
```auto
Assertion `this->Table->rowHeight(i) == newHeight` failed in /Volumes/D/P/S-0-build/CTK/Libs/Widgets/ctkMatrixWidget.cpp line 253
Assertion `this->Table->rowHeight(i) == newHeight` failed in /Volumes/D/P/S-0-build/CTK/Libs/Widgets/ctkMatrixWidget.cpp line 253
Assertion `this->Table->rowHeight(i) == newHeight` failed in /Volumes/D/P/S-0-build/CTK/Libs/Widgets/ctkMatrixWidget.cpp line 253
Assertion `this->Table->rowHeight(i) == newHeight` failed in /Volumes/D/P/S-0-build/CTK/Libs/Widgets/ctkMatrixWidget.cpp line 253
Assertion `this->Table->rowHeight(i) == newHeight` failed in /Volumes/D/P/S-0-build/CTK/Libs/Widgets/ctkMatrixWidget.cpp line 253
Assertion `this->Table->rowHeight(i) == newHeight` failed in /Volumes/D/P/S-0-build/CTK/Libs/Widgets/ctkMatrixWidget.cpp line 253
Assertion `this->Table->rowHeight(i) == newHeight` failed in /Volumes/D/P/S-0-build/CTK/Libs/Widgets/ctkMatrixWidget.cpp line 253
Assertion `this->Table->rowHeight(i) == newHeight` failed in /Volumes/D/P/S-0-build/CTK/Libs/Widgets/ctkMatrixWidget.cpp line 253
Assertion `this->Table->rowHeight(i) == newHeight` failed in /Volumes/D/P/S-0-build/CTK/Libs/Widgets/ctkMatrixWidget.cpp line 253
Assertion `this->Table->rowHeight(i) == newHeight` failed in /Volumes/D/P/S-0-build/CTK/Libs/Widgets/ctkMatrixWidget.cpp line 253
Assertion `this->Table->rowHeight(i) == newHeight` failed in /Volumes/D/P/S-0-build/CTK/Libs/Widgets/ctkMatrixWidget.cpp line 253
Failed to lock QIOSurfaceGraphicsBuffer(0x7fea4769d100, surface=0x0, size=QSize(1022, 0), isLocked=false, isInUse=false) -536870206
[1] 46337 illegal hardware instruction /Applications/Slicer.app/Contents/MacOS/Slicer
```
I hope others have faced the same issue, and that the developers can get an idea of where the issue might be coming from. Let me know if there’s anything else I can do to help.
I’m using today’s preview on macOS Catalina `10.15.5`.
---
### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [July 28, 2020, 7:20pm UTC](https://discourse.slicer.org/t/latest-slicer-preview-release-crashes-randomly-on-macos-catalina/12759/2 "2020-07-28T19:20:24Z")
Thanks for letting us know. Have you built Slicer yourself or you use an official build? Which Slicer version is this? Has this version worked robustly before? Have you installed any extensions or added any modules? Do the two last lines (“Failed to lock QIOSurfaceGraphicsBuffer…” and “illegal hardware instruction”) appear right before the application crashes?
---
### Author:  [@Fernando](https://discourse.slicer.org/u/Fernando)
#### Post date: [July 28, 2020, 7:59pm UTC](https://discourse.slicer.org/t/latest-slicer-preview-release-crashes-randomly-on-macos-catalina/12759/3 "2020-07-28T19:59:23Z")
> [@lassoan](#):
>
> Have you built Slicer yourself or you use an official build?
Official build.
> [@lassoan](#):
>
> Which Slicer version is this?
Today’s preview, i.e. `4.11.0-2020-07-27 r29229 / 1217275`. It has happened with other versions, I think all in this month.
> [@lassoan](#):
>
> Has this version worked robustly before?
I update Slicer often, so it’s hard to know.
> [@lassoan](#):
>
> Have you installed any extensions or added any modules?
I add a couple of modules and so some other stuff in my `.slicerrc.py`, but I haven’t touched it in months.
> [@lassoan](#):
>
> Do the two last lines (“Failed to lock QIOSurfaceGraphicsBuffer…” and “illegal hardware instruction”) appear right before the application crashes?
I don’t know, I see them in the console after Slicer crashes, so that seems to be the case.
---
### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [July 28, 2020, 8:07pm UTC](https://discourse.slicer.org/t/latest-slicer-preview-release-crashes-randomly-on-macos-catalina/12759/4 "2020-07-28T20:07:30Z")
@Sam_Horvath Have we ended up updating Qt version on Mac when we updated it on other platforms?
---
### Author:  [@jamesobutler](https://discourse.slicer.org/u/jamesobutler)
#### Post date: [July 29, 2020, 1:08am UTC](https://discourse.slicer.org/t/latest-slicer-preview-release-crashes-randomly-on-macos-catalina/12759/5 "2020-07-29T01:08:04Z")
Looks like it is hitting the same assert that was crashing QtDesigner previously (See [https://github.com/commontk/CTK/commit/0e1d94593d900fd144f50af38e3240063ab30484#diff-6f073d1f96143635788f382f18279749](https://github.com/commontk/CTK/commit/0e1d94593d900fd144f50af38e3240063ab30484#diff-6f073d1f96143635788f382f18279749))
@lassoan Yes, the macOS nightly build is using Qt 5.15.0 which was done around the same time as the Windows upgrade.
---
### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [July 29, 2020, 1:22am UTC](https://discourse.slicer.org/t/latest-slicer-preview-release-crashes-randomly-on-macos-catalina/12759/6 "2020-07-29T01:22:00Z")
> [@jamesobutler](#):
>
> Looks like it is hitting the same assert that was crashing QtDesigner previously (See [Fix QtDesigner crash in debug mode · commontk/CTK@0e1d945 · GitHub](https://github.com/commontk/CTK/commit/0e1d94593d900fd144f50af38e3240063ab30484#diff-6f073d1f96143635788f382f18279749))
First I thought so, too, but it is not a debug-mode build, so assert does not cause crash.
---
### Author:  [@pieper](https://discourse.slicer.org/u/pieper)
#### Post date: [July 31, 2020, 6:54pm UTC](https://discourse.slicer.org/t/latest-slicer-preview-release-crashes-randomly-on-macos-catalina/12759/7 "2020-07-31T18:54:04Z")
I got this message and crash today too with a local debug build of slicer on mac with Qt 5.15. Nothing about illegal hardware instruction though.
```auto
Switch to module: "Volumes"
Failed to lock QIOSurfaceGraphicsBuffer(0x7fbc063721a0, surface=0x0, size=QSize(484, 0), isLocked=false, isInUse=false) -536870206
error: [/opt/s/Slicer-build/bin/Slicer.app/Contents/MacOS/./Slicer] exit abnormally - Report the problem.
```
---
### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [July 31, 2020, 7:05pm UTC](https://discourse.slicer.org/t/latest-slicer-preview-release-crashes-randomly-on-macos-catalina/12759/8 "2020-07-31T19:05:57Z")
> [@pieper](#):
>
> `Failed to lock QIOSurfaceGraphicsBuffer`
Is there a chance you can get a stack trace?
---
### Author:  [@pieper](https://discourse.slicer.org/u/pieper)
#### Post date: [July 31, 2020, 8:09pm UTC](https://discourse.slicer.org/t/latest-slicer-preview-release-crashes-randomly-on-macos-catalina/12759/9 "2020-07-31T20:09:35Z")
I did, but it wan’t informative. I’ll share it next time it happens.
---
### Author:  [@Fernando](https://discourse.slicer.org/u/Fernando)
#### Post date: [August 5, 2020, 6:08pm UTC](https://discourse.slicer.org/t/latest-slicer-preview-release-crashes-randomly-on-macos-catalina/12759/10 "2020-08-05T18:08:22Z")
> [@lassoan](#):
>
> Is there a chance you can get a stack trace?
Does this help?
[https://gist.github.com/fepegar/131d0562088550e9fd8ecba7f4436005](https://gist.github.com/fepegar/131d0562088550e9fd8ecba7f4436005)
---
### Author:  [@pieper](https://discourse.slicer.org/u/pieper)
#### Post date: [August 5, 2020, 6:20pm UTC](https://discourse.slicer.org/t/latest-slicer-preview-release-crashes-randomly-on-macos-catalina/12759/11 "2020-08-05T18:20:44Z")
That looks like what I’ve been seeing. Something between Qt and macOS.
---
### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [August 6, 2020, 3:45am UTC](https://discourse.slicer.org/t/latest-slicer-preview-release-crashes-randomly-on-macos-catalina/12759/12 "2020-08-06T03:45:11Z")
Thank you @Fernando, this is very useful. In this stack trace the crash is triggered by `ctkBasePopupWidget::setEffectGeometry(QRect)` making a widget visible.
I did some web search for Qt crashes on MacOS Catalina and there were just a few that were vaguely similar, so most probably it is also something special about how Qt is used - most probably something in VTK but maybe in CTK.
@jcfr do you know if Paraview started to use Qt-5.15 yet?
---
### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [August 6, 2020, 3:46am UTC](https://discourse.slicer.org/t/latest-slicer-preview-release-crashes-randomly-on-macos-catalina/12759/13 "2020-08-06T03:46:28Z")
Similar issue reported by another user:
> I am experiencing a similar problem. My 3D Slicer didn’t crash until I returned to it after some time (I was working inside google docs for approx. 30minutes). I am not 100% certain, but I think it happened when clicking into the scene after returning.
>
> Looks like an OpenGL/VTK issue to me. Here the Stack Trace:
> [Slicer\_crash\_08\_04\_2020 · GitHub](https://gist.github.com/che85/f050d34b59ba7bf4463dc849b1f89723)
---
### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [August 6, 2020, 3:55am UTC](https://discourse.slicer.org/t/latest-slicer-preview-release-crashes-randomly-on-macos-catalina/12759/14 "2020-08-06T03:55:58Z")
Another occurrence reported by a user, just after starting Slicer, he started screen recording, then moved the Slicer application window a bit, then when the mouse was moved over the top-left corner of the 3D view, Slicer crashed. Probably it went over the push-pin icon.
> **Slicer application log**
>
> ```auto
> ##[DEBUG][Qt] 05.08.2020 11:40:01 [] (unknown:0) - Session start time .......: 2020-08-05 11:40:01
> [DEBUG][Qt] 05.08.2020 11:40:01 [] (unknown:0) - Slicer version ...........: 4.11.0-2020-08-02 (revision 29250 / 1a8a340) macosx-amd64 - installed release
> [DEBUG][Qt] 05.08.2020 11:40:01 [] (unknown:0) - Operating system .........: Mac OS X / 10.15.5 / 19F101 - 64-bit
> [DEBUG][Qt] 05.08.2020 11:40:01 [] (unknown:0) - Memory ...................: 32768 MB physical, 2048 MB virtual
> [DEBUG][Qt] 05.08.2020 11:40:01 [] (unknown:0) - CPU ......................: GenuineIntel Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz, 8 cores, 16 logical processors
> [DEBUG][Qt] 05.08.2020 11:40:01 [] (unknown:0) - VTK configuration ........: OpenGL2 rendering, Sequential threading
> [DEBUG][Qt] 05.08.2020 11:40:01 [] (unknown:0) - Qt configuration .........: version 5.15.0, with SSL, requested OpenGL 3.2 (core profile)
> [DEBUG][Qt] 05.08.2020 11:40:01 [] (unknown:0) - Developer mode enabled ...: no
> [DEBUG][Qt] 05.08.2020 11:40:01 [] (unknown:0) - Prefer executable CLI ....: yes
> [DEBUG][Qt] 05.08.2020 11:40:01 [] (unknown:0) - Application path .........: /Applications/Slicer 5.app/Contents/MacOS
> [DEBUG][Qt] 05.08.2020 11:40:01 [] (unknown:0) - Additional module paths ..: /Users/cianciulla/sources/SlicerHeart/CardiacDeviceSimulator, /Users/cianciulla/sources/SlicerHeart/Philips4dUsDicomPatcher, /Users/cianciulla/sources/SlicerHeartCollaborators/LeafletAnalysis, /Users/cianciulla/sources/SlicerHeartCollaborators/ValveAnnulusAnalysis, /Users/cianciulla/sources/SlicerHeartCollaborators/ValveQuantification, /Users/cianciulla/sources/SlicerHeartCollaborators/ValveSegmentation, /Users/cianciulla/sources/SlicerHeartPrivate/BafflePlanner, /Users/cianciulla/sources/SlicerHeartPrivate/CardiacDeviceSimulatorExtender, /Users/cianciulla/sources/SlicerHeartPrivate/CrossSectionAnalyzer, /Users/cianciulla/sources/SlicerHeartPrivate/EchoVolumeRender, /Users/cianciulla/sources/SlicerHeartPrivate/LeafletEditorTest, /Users/cianciulla/sources/SlicerHeartPrivate/LeafletMoldGenerator, /Users/cianciulla/sources/SlicerHeartPrivate/MitraClipDeviceSimulator, /Users/cianciulla/sources/SlicerHeartPrivate/TranscatheterDeviceSimulator, /Users/cianciulla/sources/SlicerHeartPrivate/ValveBatchExport, /Users/cianciulla/sources/SlicerHeartPrivate/ValveFemExport, /Users/cianciulla/sources/SlicerHeartPrivate/ValvePapillaryAnalysis, /Users/cianciulla/sources/SlicerHeartPrivate/ValveQuantificationExtender, /Applications/Slicer 5.app/Contents/Extensions-29250/MarkupsToModel/lib/Slicer-4.11/qt-loadable-modules, /Applications/Slicer 5.app/Contents/Extensions-29250/SlicerHeart/lib/Slicer-4.11/cli-modules, /Applications/Slicer 5.app/Contents/Extensions-29250/SlicerHeart/lib/Slicer-4.11/qt-loadable-modules, /Applications/Slicer 5.app/Contents/Extensions-29250/SlicerHeart/lib/Slicer-4.11/qt-scripted-modules, /Applications/Slicer 5.app/Contents/Extensions-29250/SlicerIGT/lib/Slicer-4.11/qt-loadable-modules, /Applications/Slicer 5.app/Contents/Extensions-29250/SlicerIGT/lib/Slicer-4.11/qt-scripted-modules, /Applications/Slicer 5.app/Contents/Extensions-29250/SlicerOpenIGTLink/lib/Slicer-4.11/qt-loadable-modules, /Applications/Slicer 5.app/Contents/Extensions-29250/SlicerOpenIGTLink/lib/Slicer-4.11/qt-scripted-modules, /Applications/Slicer 5.app/Contents/Extensions-29250/VolumeClip/lib/Slicer-4.11/qt-scripted-modules
> [DEBUG][Python] 05.08.2020 11:40:02 [Python] (/Applications/Slicer 5.app/Contents/lib/Python/lib/python3.6/site-packages/pydicom/datadict.py:432) - Reversing DICOM dictionary so can look up tag from a keyword...
> [DEBUG][Python] 05.08.2020 11:40:03 [Python] (/Applications/Slicer 5.app/Contents/lib/Slicer-4.11/qt-scripted-modules/SubjectHierarchyPlugins/AbstractScriptedSubjectHierarchyPlugin.py:36) - Scripted subject hierarchy plugin registered: Annotations
> [DEBUG][Python] 05.08.2020 11:40:04 [Python] (/Applications/Slicer 5.app/Contents/lib/Slicer-4.11/qt-scripted-modules/SubjectHierarchyPlugins/AbstractScriptedSubjectHierarchyPlugin.py:36) - Scripted subject hierarchy plugin registered: SegmentEditor
> [DEBUG][Python] 05.08.2020 11:40:04 [Python] (/Applications/Slicer 5.app/Contents/lib/Slicer-4.11/qt-scripted-modules/SubjectHierarchyPlugins/AbstractScriptedSubjectHierarchyPlugin.py:36) - Scripted subject hierarchy plugin registered: SegmentStatistics
> [DEBUG][Python] 05.08.2020 11:40:05 [Python] (/Users/cianciulla/sources/SlicerHeartCollaborators/ValveAnnulusAnalysis/HeartValveLib/HeartValves.py:407) - updateLegacyHeartValveNodes
> [DEBUG][Python] 05.08.2020 11:40:05 [Python] (/Users/cianciulla/sources/SlicerHeartCollaborators/ValveAnnulusAnalysis/HeartValveLib/HeartValves.py:25) - Added scene end import observer for HeartValves
> [DEBUG][Python] 05.08.2020 11:40:05 [Python] (/Applications/Slicer 5.app/Contents/lib/Slicer-4.11/qt-scripted-modules/SubjectHierarchyPlugins/AbstractScriptedSubjectHierarchyPlugin.py:36) - Scripted subject hierarchy plugin registered: HeartValves
> [DEBUG][Qt] 05.08.2020 11:40:04 [] (unknown:0) - Switch to module: "Welcome"
> [INFO][VTK] 05.08.2020 11:40:05 [vtkMRMLVolumeArchetypeStorageNode (0x7f83fcce1a20)] (/Volumes/D/P/S-0/Libs/MRML/Core/vtkMRMLVolumeArchetypeStorageNode.cxx:470) - Loaded volume from file: /Users/cianciulla/sources/SlicerHeartCollaborators/ValveAnnulusAnalysis/Resources/VrPresets/US-Red-Tinge.png. Dimensions: 65x50x1. Number of components: 4. Pixel type: unsigned char.
> [INFO][VTK] 05.08.2020 11:40:05 [vtkMRMLVolumeArchetypeStorageNode (0x7f83fcce1da0)] (/Volumes/D/P/S-0/Libs/MRML/Core/vtkMRMLVolumeArchetypeStorageNode.cxx:470) - Loaded volume from file: /Users/cianciulla/sources/SlicerHeartCollaborators/ValveAnnulusAnalysis/Resources/VrPresets/US-Red.png. Dimensions: 65x50x1. Number of components: 4. Pixel type: unsigned char.
> [INFO][VTK] 05.08.2020 11:40:05 [vtkMRMLVolumeArchetypeStorageNode (0x7f83fcce1fa0)] (/Volumes/D/P/S-0/Libs/MRML/Core/vtkMRMLVolumeArchetypeStorageNode.cxx:470) - Loaded volume from file: /Users/cianciulla/sources/SlicerHeartCollaborators/ValveAnnulusAnalysis/Resources/VrPresets/US-Ocean.png. Dimensions: 65x50x1. Number of components: 4. Pixel type: unsigned char.
> [INFO][VTK] 05.08.2020 11:40:05 [vtkMRMLVolumeArchetypeStorageNode (0x7f83fcce21a0)] (/Volumes/D/P/S-0/Libs/MRML/Core/vtkMRMLVolumeArchetypeStorageNode.cxx:470) - Loaded volume from file: /Users/cianciulla/sources/SlicerHeartCollaborators/ValveAnnulusAnalysis/Resources/VrPresets/US-Grey.png. Dimensions: 65x50x1. Number of components: 4. Pixel type: unsigned char.
> [INFO][VTK] 05.08.2020 11:40:05 [vtkMRMLVolumeArchetypeStorageNode (0x7f83fcce23a0)] (/Volumes/D/P/S-0/Libs/MRML/Core/vtkMRMLVolumeArchetypeStorageNode.cxx:470) - Loaded volume from file: /Users/cianciulla/sources/SlicerHeartCollaborators/ValveAnnulusAnalysis/Resources/VrPresets/US-Silver.png. Dimensions: 65x50x1. Number of components: 4. Pixel type: unsigned char.
> [INFO][VTK] 05.08.2020 11:40:05 [vtkMRMLVolumeArchetypeStorageNode (0x7f83fcce25a0)] (/Volumes/D/P/S-0/Libs/MRML/Core/vtkMRMLVolumeArchetypeStorageNode.cxx:470) - Loaded volume from file: /Users/cianciulla/sources/SlicerHeartCollaborators/ValveAnnulusAnalysis/Resources/VrPresets/US-Green.png. Dimensions: 65x50x1. Number of components: 4. Pixel type: unsigned char.
> [INFO][VTK] 05.08.2020 11:40:05 [vtkMRMLVolumeArchetypeStorageNode (0x7f83fcce27a0)] (/Volumes/D/P/S-0/Libs/MRML/Core/vtkMRMLVolumeArchetypeStorageNode.cxx:470) - Loaded volume from file: /Users/cianciulla/sources/SlicerHeartCollaborators/ValveAnnulusAnalysis/Resources/VrPresets/US-InverseGreen.png. Dimensions: 65x50x1. Number of components: 3. Pixel type: unsigned char.
> [INFO][VTK] 05.08.2020 11:40:05 [vtkMRMLVolumeArchetypeStorageNode (0x7f83fcce29a0)] (/Volumes/D/P/S-0/Libs/MRML/Core/vtkMRMLVolumeArchetypeStorageNode.cxx:470) - Loaded volume from file: /Users/cianciulla/sources/SlicerHeartCollaborators/ValveAnnulusAnalysis/Resources/VrPresets/CT-EndoVascular.png. Dimensions: 65x50x1. Number of components: 3. Pixel type: unsigned char.
> [WARNING][Qt] 05.08.2020 11:40:31 [] (unknown:0) - Tried to flush backingstore without painting to it first
>
> ```
---
### Author:  [@pieper](https://discourse.slicer.org/u/pieper)
#### Post date: [August 6, 2020, 9:01pm UTC](https://discourse.slicer.org/t/latest-slicer-preview-release-crashes-randomly-on-macos-catalina/12759/15 "2020-08-06T21:01:14Z")
I just got another crash with a stack trace like @Fernando’s. I believe the cursor just brushed over the pin icon.
It looks like it is the `QAnimation` used by `ctkPopupWidget`. Maybe the exit event happens and the widget is deleted before the animation gets started or something like that.
Perhaps the easiest would be to turn off that animation feature and just have popup appear and disappear instantly. I personally wouldn’t miss the animation and would prefer a more stable application.
```auto
Process: Slicer [44397]
Path: /Applications/Slicer.app/Contents/MacOS/Slicer
Identifier: ???
Version: ??? (4.11.0-2020-07-24)
Code Type: X86-64 (Native)
Parent Process: ??? [44396]
Responsible: Terminal [349]
User ID: 501
Date/Time: 2020-08-06 16:52:56.791 -0400
OS Version: Mac OS X 10.15.6 (19G73)
Report Version: 12
Bridge OS Version: 4.6 (17P6065)
Anonymous UUID: 3797FBED-83D2-B47D-D4EA-26F22AA011DE
Time Awake Since Boot: 690000 seconds
System Integrity Protection: enabled
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_INSTRUCTION (SIGILL)
Exception Codes: 0x0000000000000001, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Termination Signal: Illegal instruction: 4
Termination Reason: Namespace SIGNAL, Code 0x4
Terminating Process: exc handler [44397]
Application Specific Information:
***CFRetain() called with NULL***
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 com.apple.CoreFoundation 0x00007fff39b4398f CFRetain.cold.1 + 14
1 com.apple.CoreFoundation 0x00007fff39996a08 CFRetain + 109
2 libqcocoa.dylib 0x000000012277d487 0x122764000 + 103559
3 libqcocoa.dylib 0x000000012277d5a1 0x122764000 + 103841
4 org.qt-project.QtGui 0x0000000103d61f50 QBackingStore::beginPaint(QRegion const&) + 208
5 org.qt-project.QtWidgets 0x00000001035ec5e4 0x1035ce000 + 124388
6 org.qt-project.QtWidgets 0x00000001035ead45 0x1035ce000 + 118085
7 org.qt-project.QtWidgets 0x000000010363a404 0x1035ce000 + 443396
8 org.qt-project.QtWidgets 0x00000001036373fd 0x1035ce000 + 431101
9 org.qt-project.QtWidgets 0x00000001035df01a QApplicationPrivate::notify_helper(QObject*, QEvent*) + 266
10 org.qt-project.QtWidgets 0x00000001035e04a6 QApplication::notify(QObject*, QEvent*) + 598
11 libqSlicerBaseQTGUI.dylib 0x00000001027e1f75 qSlicerApplication::notify(QObject*, QEvent*) + 21
12 org.qt-project.QtCore 0x0000000104374cf4 QCoreApplication::notifyInternal2(QObject*, QEvent*) + 212
13 org.qt-project.QtGui 0x0000000103bb8a82 QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) + 306
14 org.qt-project.QtGui 0x0000000103b94d83 bool QWindowSystemInterfacePrivate::handleWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) + 115
15 org.qt-project.QtGui 0x0000000103b9c442 void QWindowSystemInterface::handleExposeEvent(QWindow*, QRegion const&) + 178
16 libqcocoa.dylib 0x0000000122785fbc 0x122764000 + 139196
17 libqcocoa.dylib 0x000000012278e7bb 0x122764000 + 174011
18 com.apple.QuartzCore 0x00007fff4550853c -[CALayer display] + 180
19 com.apple.AppKit 0x00007fff36e1069a -[_NSBackingLayer display] + 537
20 com.apple.AppKit 0x00007fff36d72187 -[_NSViewBackingLayer display] + 800
21 com.apple.QuartzCore 0x00007fff45507e09 CA::Layer::display_if_needed(CA::Transaction*) + 757
22 com.apple.QuartzCore 0x00007fff454e6106 CA::Context::commit_transaction(CA::Transaction*, double) + 334
23 com.apple.QuartzCore 0x00007fff454e4cf0 CA::Transaction::commit() + 644
24 com.apple.AppKit 0x00007fff370dcaeb -[_NSOrderOutAnimationProxyWindow initWithSnapshotOfWindow:] + 50
25 com.apple.AppKit 0x00007fff36f2b5a1 -[_NSWindowTransformAnimation initWithWindow:type:interruptingAnimation:] + 702
26 com.apple.AppKit 0x00007fff36f2b2cf +[_NSWindowTransformAnimation windowTransformAnimationWithWindow:type:interruptingAnimation:] + 49
27 com.apple.AppKit 0x00007fff36de507f -[NSWindow _doOrderWindow:relativeTo:findKey:forCounter:force:isModal:] + 614
28 com.apple.AppKit 0x00007fff36de4db7 -[NSWindow orderWindow:relativeTo:] + 155
29 libqcocoa.dylib 0x000000012278201a 0x122764000 + 122906
30 org.qt-project.QtGui 0x0000000103bbf948 QWindowPrivate::setVisible(bool) + 1112
31 org.qt-project.QtWidgets 0x0000000103617055 QWidgetPrivate::hide_sys() + 229
32 org.qt-project.QtWidgets 0x0000000103616711 QWidgetPrivate::setGeometry_sys(int, int, int, int, bool) + 945
33 org.qt-project.QtWidgets 0x0000000103616ec8 QWidget::setGeometry(QRect const&) + 264
34 libCTKWidgets.0.1.dylib 0x0000000102e56452 ctkBasePopupWidget::setEffectGeometry(QRect) + 34
35 libCTKWidgets.0.1.dylib 0x0000000102ef0ee7 ctkBasePopupWidget::qt_metacall(QMetaObject::Call, int, void**) + 71
36 libCTKWidgets.0.1.dylib 0x0000000102efe258 ctkPopupWidget::qt_metacall(QMetaObject::Call, int, void**) + 24
37 org.qt-project.QtCore 0x000000010418acff 0x10417d000 + 56575
38 org.qt-project.QtCore 0x000000010418783a 0x10417d000 + 43066
39 org.qt-project.QtCore 0x0000000104187679 0x10417d000 + 42617
40 org.qt-project.QtCore 0x0000000104183e89 QAbstractAnimation::setCurrentTime(int) + 297
41 org.qt-project.QtCore 0x0000000104183d06 0x10417d000 + 27910
42 org.qt-project.QtCore 0x0000000104182488 QUnifiedTimer::updateAnimationTimers(long long) + 328
43 org.qt-project.QtCore 0x0000000104184ea6 QAnimationDriver::advance() + 38
44 org.qt-project.QtCore 0x000000010439fb3f QObject::event(QEvent*) + 111
45 org.qt-project.QtWidgets 0x00000001035df01a QApplicationPrivate::notify_helper(QObject*, QEvent*) + 266
46 org.qt-project.QtWidgets 0x00000001035e04a6 QApplication::notify(QObject*, QEvent*) + 598
47 libqSlicerBaseQTGUI.dylib 0x00000001027e1f75 qSlicerApplication::notify(QObject*, QEvent*) + 21
48 org.qt-project.QtCore 0x0000000104374cf4 QCoreApplication::notifyInternal2(QObject*, QEvent*) + 212
49 org.qt-project.QtCore 0x00000001043da24f QTimerInfoList::activateTimers() + 991
50 libqcocoa.dylib 0x000000012279c4a2 0x122764000 + 230562
51 com.apple.CoreFoundation 0x00007fff39a16d52 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
52 com.apple.CoreFoundation 0x00007fff39a16cf1 __CFRunLoopDoSource0 + 103
53 com.apple.CoreFoundation 0x00007fff39a16b0b __CFRunLoopDoSources0 + 209
54 com.apple.CoreFoundation 0x00007fff39a1583a __CFRunLoopRun + 927
55 com.apple.CoreFoundation 0x00007fff39a14e3e CFRunLoopRunSpecific + 462
56 com.apple.HIToolbox 0x00007fff38641abd RunCurrentEventLoopInMode + 292
57 com.apple.HIToolbox 0x00007fff386417d5 ReceiveNextEventCommon + 584
58 com.apple.HIToolbox 0x00007fff38641579 _BlockUntilNextEventMatchingListInModeWithFilter + 64
59 com.apple.AppKit 0x00007fff36c87039 _DPSNextEvent + 883
60 com.apple.AppKit 0x00007fff36c85880 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1352
61 com.apple.AppKit 0x00007fff36c7758e -[NSApplication run] + 658
62 libqcocoa.dylib 0x000000012279d1df 0x122764000 + 233951
63 org.qt-project.QtCore 0x0000000104370d9f QEventLoop::exec(QFlags) + 431
64 org.qt-project.QtCore 0x0000000104375302 QCoreApplication::exec() + 130
65 libqSlicerBaseQTCore.dylib 0x00000001030f8079 qSlicerCoreApplication::exec() + 9
66 0x0000000102461423 main + 483
67 libdyld.dylib 0x00007fff738e8cc9 start + 1
```
---
### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [August 7, 2020, 3:11am UTC](https://discourse.slicer.org/t/latest-slicer-preview-release-crashes-randomly-on-macos-catalina/12759/16 "2020-08-07T03:11:26Z")
Yes, that animation is not very useful and slownthings down, so I would not mind disabling it.
The popup window of slider widget in Volumes module caused crash, too.
---
### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [August 11, 2020, 1:47am UTC](https://discourse.slicer.org/t/latest-slicer-preview-release-crashes-randomly-on-macos-catalina/12759/17 "2020-08-11T01:47:06Z")
We have fixed the issue ([https://github.com/Slicer/Slicer/issues/5092](https://github.com/Slicer/Slicer/issues/5092)), no crash should occur in Slicer Preview Releases downloaded 2020-08-11 or later. Let us know if you still experience similar problems.
I’ve also shortened the animation duration to 10% of the original, so popup windows appear immediately now.