Operating system: Windows 10 64x
Graphics card: Geforce 1070
Short description of error
When pressing Ctrl + Z until undo all the brush strokes i did, the texture o the viewport was not going back to blank.
After a few trys, the file crashed. You can see it on the video. You will even see that after it crashed, it began to behave different.
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).