How to reproduce:
1. Open the attached "ProBuilderErrorMessages.zip" project
2. In the Scene view tools, select Create Sprite
3. Enter 2D view
4. Hold Shift and try to move your mouse around anywhere in the scene
5. Observe the console
Actual result: The console logs lots of "Look rotation viewing vector is zero" messages
Expected result: The console does not log any messages
Reproducible with: 6.0.5 (6000.0.0b16), 6.0.8 (6000.0.66f1, 6000.3.5f1, 6000.4.0b5, 6000.5.0a5)
Not reproducible with: 6.0.4 (6000.0.0b16)
Reproducible on: Windows 11, Windows 10 (by user)
Not reproducible on: No other environments tested
Notes:
- The full error message reads:
Look rotation viewing vector is zero
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)
- The issue also reproduces with other objects selected in the creation tool, but most consistently with Create Sprite