Created attachment 80560 [details]
screenshot of a bug

Problem description: 
after 10-20 minutes of normal editing screen starts to flash every time i change something in the doc 
Steps to reproduce:
1. open a file
2. start editing it
3. and in the middle of the work screen starts to flash weird pixelated things and a ubuntu's boot logo

i suspect it's something related to compiz or graphic driver but LibreWriter is the only software that causes such bug
Current behavior:
its impossible to change table width because screen is totaly pixelates every time i click on table border
its almost impossible to navigate due to pixelation that occures when i press the scroll bar on the right
Expected behavior:
it should work flaulessly
Operating System: Ubuntu
Version: 4.0.2.2 release