I've been having this issue since I started using Blender, but just kind of went along with it. Now its becoming a genuine issue though. Whenever I select vertices in Blender (Box select, Lasso, C, etc) While viewing the object in Solid mode, Blender also selects other random vertices. I'm using 2.78. I do not feel a blend file would help as this problem has been reoccuring every time I use blender; it's not isolated to a specific file.

This issue does not occur when selecting vertices in wireframe mode;

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    Can you provide some additional information? eg. blender version Maybe a blendfile for testing purposes? – Delagone Dec 9 '16 at 14:43
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    This is neither a normal behaviour nor any feature and Proportional Editing shouldn't affect selecting. These seem to be related - blender.stackexchange.com/questions/15107/… and blender.stackexchange.com/questions/49456/…. More than likely this is a bug. – Mr Zak Dec 9 '16 at 15:51
  • I have the same problem, have you found a solution? – bubakazouba Nov 8 at 3:32
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    @bubakazouba I had to format my computer to get it working again. My guess is it is some kind of bug that exists outside of the blender software, because re-installing blender did not fix the issue. – Josh Silveous Nov 8 at 3:35

This might do the trick:

  1. Go to 'user preferences'
  2. Under 'system' search for Window Draw Method
  3. Change it to 'No Multisample' (this disables the antialias in the 3D view).

enter image description here

  • It's already set to that. Thanks though. – Josh Silveous Dec 9 '16 at 14:56
  • One last thing... if 'Window Draw Method' is set to 'No Multisample', try setting it to a different value. Just might work, stating the obvious :) That's about all I can think off. – Delagone Dec 9 '16 at 15:01

This is the result of enabling the proportional falloff tool.

If you disable it the problem should be solved.

My guess is you accidentally pressed the shortcut 'O' enter image description here

  • Disabling it does not change the results. It still selects random vertices. – Josh Silveous Dec 9 '16 at 14:38
  • Is the problem occurring on that specific model or is it an issue to the whole blendfile? – Delagone Dec 9 '16 at 14:41
  • It's not a specific Blend or object, It's happened with every time I've used Blender Since I got it (~A year ago) – Josh Silveous Dec 9 '16 at 14:43
  • Yes, I have tried. Have you tested if this problem occurs on your computer as well by any chance? This could just be an odd feature in Blender.. – Josh Silveous Dec 9 '16 at 14:47

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