# Green horizontal lines appear in Slicer-4.10.2 at startup

**URL:** <https://discourse.slicer.org/t/green-horizontal-lines-appear-in-slicer-4-10-2-at-startup/12090>\
**Category:** Support\
**Created:** [June 18, 2020, 10:35am UTC](https://discourse.slicer.org/t/green-horizontal-lines-appear-in-slicer-4-10-2-at-startup/12090 "2020-06-18T10:35:26Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![calvin.kohwy](https://avatars.discourse-cdn.com/v4/letter/c/4bbf92/32.png) [@calvin.kohwy](https://discourse.slicer.org/u/calvin.kohwy)\
**Post date:** [June 18, 2020, 10:35am UTC](https://discourse.slicer.org/t/green-horizontal-lines-appear-in-slicer-4-10-2-at-startup/12090/1 "2020-06-18T10:35:26Z")

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Operating system: Windows 10 i7  
Slicer version: 4.10.2

Hi all

I have been using slicer with my pc for quite sometime. However, out of the blue, the following happen to my slicer as shown in the image below. I had tried reinstalling it but it does not work. Do you have any idea what is happening?

Thank you

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/c/b/cb1d7ed425d74d804f617f378364c5d8902f3455.png)

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [June 18, 2020, 1:55pm UTC](https://discourse.slicer.org/t/green-horizontal-lines-appear-in-slicer-4-10-2-at-startup/12090/2 "2020-06-18T13:55:32Z")

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This looks like a graphics card driver update broke OpenGL rendering on your computer.

What graphics card do you have in the computer and what is the driver version?  
Is the behavior the same with latest Slicer Preview Release?  
Are other VTK-based applications, such as ParaView, have similar rendering issues?

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**Author:** ![calvin.kohwy](https://avatars.discourse-cdn.com/v4/letter/c/4bbf92/32.png) [@calvin.kohwy](https://discourse.slicer.org/u/calvin.kohwy)\
**Post date:** [June 18, 2020, 2:30pm UTC](https://discourse.slicer.org/t/green-horizontal-lines-appear-in-slicer-4-10-2-at-startup/12090/3 "2020-06-18T14:30:04Z")

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Hi

I am using GTX 1660 Ti v446.14. I was working with this graphic card all these while and it was working perfectly fine with slicer. It just happen to be crash one day when i was loading dicom files. The next moment when i restarted slicer, this happened.

Paraview is working perfectly fine as well.

Yes, it has the same behavior with the latest preview release.

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [June 18, 2020, 2:51pm UTC](https://discourse.slicer.org/t/green-horizontal-lines-appear-in-slicer-4-10-2-at-startup/12090/4 "2020-06-18T14:51:47Z")

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Slicer crash may corrupt the application settings file. The strange rendering artifacts is not a typical symptom, but you can give it a try and run Slicer with default settings - see here: [https://www.slicer.org/wiki/Documentation/Nightly/Developers/Tutorials/Troubleshooting#Instruction\_for\_Windows](https://www.slicer.org/wiki/Documentation/Nightly/Developers/Tutorials/Troubleshooting#Instruction_for_Windows) (and delete application settings if that solves the problem).

Another possibility that Windows determined that the crash was due to to application compatibility issue and decided to run Slicer in some compatibility mode. Right-click on SlicerApp-real.exe and play around with settings in “Compatibility” tab.

Is this a laptop with NVidia Optimus? Do you have multiple monitors connected? Any of the monitors are HiDPI?

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**Author:** ![calvin.kohwy](https://avatars.discourse-cdn.com/v4/letter/c/4bbf92/32.png) [@calvin.kohwy](https://discourse.slicer.org/u/calvin.kohwy)\
**Post date:** [June 18, 2020, 4:18pm UTC](https://discourse.slicer.org/t/green-horizontal-lines-appear-in-slicer-4-10-2-at-startup/12090/5 "2020-06-18T16:18:57Z")

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The link you had provided does not work for this case. However, one of the error i had found in event view is the following:

> Faulting application name: SlicerApp-real.exe, version: 0.0.0.0, time stamp: 0x5cddc587  
> Faulting module name: Qt5Gui.dll, version: 5.10.1.0, time stamp: 0x5a7c816f  
> Exception code: 0xc0000005  
> Fault offset: 0x0000000000313186  
> Faulting process id: 0x3544  
> Faulting application start time: 0x01d6377bd7b23133  
> Faulting application path: C:\Program Files\Slicer 4.10.2\bin\SlicerApp-real.exe  
> Faulting module path: C:\Program Files\Slicer 4.10.2\bin\Qt5Gui.dll  
> Report Id: 03c680aa-d127-4154-8143-70b34e134720  
> Faulting package full name:  
> Faulting package-relative application ID:

> Faulting application name: SlicerApp-real.exe, version: 0.0.0.0, time stamp: 0x5cddc587  
> Faulting module name: ig9icd64.dll, version: 26.20.100.8141, time stamp: 0x5e91eea6  
> Exception code: 0xc0000005  
> Fault offset: 0x000000000002a7e2  
> Faulting process id: 0x265c  
> Faulting application start time: 0x01d625d9f1aac289  
> Faulting application path: C:\Program Files\Slicer 4.10.2\bin\SlicerApp-real.exe  
> Faulting module path: C:\WINDOWS\System32\DriverStore\FileRepository\iigd\_dch.inf\_amd64\_0dd7d9c16d9ad9c5\ig9icd64.dll  
> Report Id: c2874064-8295-43b0-890e-954552200449  
> Faulting package full name:  
> Faulting package-relative application ID:

I tried playing around with the compatibility tab and the following happened:  
When i tried to “Run compatibility troubleshooter” → “Try recommended settings” → “Test the program”  
I got the following error:

> The code execution cannot proceed because CTKWidgets.dll was not found. Reinstalling the program may fix this problem"

However, i have tried reinstalling Slicer a couple of times and it does not work.

Seems like the drop down window is fine but not the main window.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/4/6/465b125ab7c294f91221fd13a997a376bd8d90b7.png)

Yes it has Nvidia Optimus. I have multiple monitors but i did test it without multiple monitors as well… None of these monitors are HiDPI. I have been using this system for quite sometime and had no issue previously.

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<div class="post-metadata">

**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [June 18, 2020, 4:25pm UTC](https://discourse.slicer.org/t/green-horizontal-lines-appear-in-slicer-4-10-2-at-startup/12090/6 "2020-06-18T16:25:16Z")

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Could you try running Slicer on the NVidia and on the Intel Integrated Graphics card?

Does deleting all Slicer\*.ini files help?

Do you have the issue when the application window is not maximized?

Could you post a screenshot taken of latest Slicer Preview Release?

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<div class="post-metadata">

**Author:** ![calvin.kohwy](https://avatars.discourse-cdn.com/v4/letter/c/4bbf92/32.png) [@calvin.kohwy](https://discourse.slicer.org/u/calvin.kohwy)\
**Post date:** [June 18, 2020, 5:01pm UTC](https://discourse.slicer.org/t/green-horizontal-lines-appear-in-slicer-4-10-2-at-startup/12090/7 "2020-06-18T17:01:19Z")

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Thank you Iassoan! It works after I delete ALL the .ini files and rename NA-MIC to NA-MIC-backup

It’s back to normal now.

Thank you for your patience!

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**Author:** ![markyang19](https://avatars.discourse-cdn.com/v4/letter/m/45deac/32.png) [@markyang19](https://discourse.slicer.org/u/markyang19)\
**Post date:** [October 17, 2020, 12:06pm UTC](https://discourse.slicer.org/t/green-horizontal-lines-appear-in-slicer-4-10-2-at-startup/12090/8 "2020-10-17T12:06:49Z")

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I have the same problem. I solve the problem by stopping my Intel HD Graphics 630 driver and only using the NVIDIA driver.

Regards.