# Unexpected landmark creation behavior in AnglePlanes extension

**URL:** <https://discourse.slicer.org/t/unexpected-landmark-creation-behavior-in-angleplanes-extension/35245>\
**Category:** Support\
**Created:** [April 3, 2024, 3:58am UTC](https://discourse.slicer.org/t/unexpected-landmark-creation-behavior-in-angleplanes-extension/35245 "2024-04-03T03:58:20Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![doc87](https://avatars.discourse-cdn.com/v4/letter/d/e99b99/32.png) [@doc87](https://discourse.slicer.org/u/doc87)\
**Post date:** [April 3, 2024, 3:58am UTC](https://discourse.slicer.org/t/unexpected-landmark-creation-behavior-in-angleplanes-extension/35245/1 "2024-04-03T03:58:20Z")

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Hello,

I’m working with the AnglePlanes extension in 3D Slicer and encountering an issue where clicking to place a single landmark results in multiple landmarks being created along the path of my cursor movement. This makes precise landmark placement difficult.

Things I’ve tried:

Using a different mouse/trackpad.  
Adjusting mouse sensitivity and double-click speed.  
Restarting 3D Slicer.  
Using an older version of 3D Slicer  
Reinstalling the AnglePlanes extension.  
My setup:

3D Slicer version: 5.6.1/ 5.4  
AnglePlanes extension version: Revision: 702ca19  
Operating System: Windows 11  
Has anyone else encountered this behavior? Any suggestions or troubleshooting tips would be greatly appreciated. Attached a video showing the bug for reference.

Thank you!