# Segment Editor - Odd cursor behavior using tablet with latest nightly builds

**URL:** <https://discourse.slicer.org/t/segment-editor-odd-cursor-behavior-using-tablet-with-latest-nightly-builds/2385>\
**Category:** Development\
**Created:** [March 21, 2018, 12:06pm UTC](https://discourse.slicer.org/t/segment-editor-odd-cursor-behavior-using-tablet-with-latest-nightly-builds/2385 "2018-03-21T12:06:35Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![hherhold](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/hherhold/32/12199_2.png) [@hherhold](https://discourse.slicer.org/u/hherhold)\
**Post date:** [March 21, 2018, 12:06pm UTC](https://discourse.slicer.org/t/segment-editor-odd-cursor-behavior-using-tablet-with-latest-nightly-builds/2385/1 "2018-03-21T12:06:35Z")

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Hey guys,

In the March 18 nightly build, I noticed some odd behavior when using my wacom tablet with the Segment Editor. If I select the paint tool and move the tool around with my mouse, the circle that represents the paintbrush moves around. If I use my pen/tablet and move the cursor around without touching the tablet to paint, the cursor moves around but there is no circle to show the paintbrush. When I touch down and paint with the pen, the circle shows up immediately and painting works fine. (Hopefully this explanation is clear…)

Any ideas? I’ve updated my tablet drivers. It is a Wacom Intuos Pro (Medium), MacOS 10.12.6.

I don’t remember having this issue a week or so ago. If someone can point me to how to get previous daily builds, I can try to narrow down when it started happening - I don’t remember how to download a nightly from say a week or two ago.

Thanks!

-Hollister

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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:** [March 21, 2018, 1:08pm UTC](https://discourse.slicer.org/t/segment-editor-odd-cursor-behavior-using-tablet-with-latest-nightly-builds/2385/2 "2018-03-21T13:08:58Z")

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Can you double-check if the behavior is different with an older version of Slicer? You can download older versions using the “offset” parameter as described here: [https://www.slicer.org/wiki/Documentation/Nightly/FAQ/General#Where\_can\_I\_download\_Slicer.3F](https://www.slicer.org/wiki/Documentation/Nightly/FAQ/General#Where_can_I_download_Slicer.3F)

I don’t think we’ve changed anything related to this in the past several months. There might have been a change in how the tablet simulates mouse events. Maybe there are settings that you can adjust (maybe you need to activate a “mouse mode” where pen generates regular mouse events).

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**Author:** ![hherhold](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/hherhold/32/12199_2.png) [@hherhold](https://discourse.slicer.org/u/hherhold)\
**Post date:** [March 21, 2018, 5:39pm UTC](https://discourse.slicer.org/t/segment-editor-odd-cursor-behavior-using-tablet-with-latest-nightly-builds/2385/3 "2018-03-21T17:39:01Z")

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Thanks for the download link - I knew it was in there somewhere.

It works properly with 1/23, fails with 2/26. Narrowing the window down now (lots of downloading). I haven’t changed any settings on my tablet, but I did try mouse vs tablet mode and there’s no difference.

Thanks, and I will keep you updated.

-Hollister

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**Author:** ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Post date:** [March 21, 2018, 6:20pm UTC](https://discourse.slicer.org/t/segment-editor-odd-cursor-behavior-using-tablet-with-latest-nightly-builds/2385/4 "2018-03-21T18:20:36Z")

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Probably this came with Qt5 then. Not sure if we can do anything, because it is a change on a very low level.

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**Author:** ![hherhold](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/hherhold/32/12199_2.png) [@hherhold](https://discourse.slicer.org/u/hherhold)\
**Post date:** [March 21, 2018, 6:32pm UTC](https://discourse.slicer.org/t/segment-editor-odd-cursor-behavior-using-tablet-with-latest-nightly-builds/2385/5 "2018-03-21T18:32:52Z")

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OK. Do you think it’s a Qt or a VTK thing?

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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:** [March 21, 2018, 6:40pm UTC](https://discourse.slicer.org/t/segment-editor-odd-cursor-behavior-using-tablet-with-latest-nightly-builds/2385/6 "2018-03-21T18:40:37Z")

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This is a Qt bug: [https://bugreports.qt.io/browse/QTBUG-65559](https://bugreports.qt.io/browse/QTBUG-65559). It is categorized to be quite low priority, so probably won’t be fixed anytime soon. You can use this workaround: hover the pen over tablet when application is started.

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**Author:** ![hherhold](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/hherhold/32/12199_2.png) [@hherhold](https://discourse.slicer.org/u/hherhold)\
**Post date:** [March 21, 2018, 6:43pm UTC](https://discourse.slicer.org/t/segment-editor-odd-cursor-behavior-using-tablet-with-latest-nightly-builds/2385/7 "2018-03-21T18:43:30Z")

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Hey, thanks Andras! Good find, and thanks for the workaround!

You guys are awesome!

-Hollister