I AM USING UNITY TWEAK TOOL that enabled the Window Spread feature to activate with hot corners. It worked fine for about a week until the Window Spread started having issues. Some windows appeared as tiny thumbnails about only 10 pixels wide and tall. I turned off Window Spread in the Unity Tweak tool and turned it back on. Now Window Spread doesn't work at all. Instead it causes this glitchfest with all of the windows disappearing, some visual glitches occur, then the windows reappear. Restarting Ubuntu does not fix the bug. Also I just removed the Unity Tweak Tool with Ubuntu Software. After the removal process, Ubuntu Software still thinks that the Unity Tweak Tool is still installed, but after restarting Ubuntu, Ubuntu Software finally knows that it has been removed.
It appears that Unity may be crashing and restarting because for a brief second everything disappears except the desktop background.
Ubuntu Version: 16.04
Package: Unity Tweak Tool, possibly Unity 7 itself
NOTICE: After checking "Scale" in the CompizConfig Settings Manager. It seems to be working again.
I could fix the bug on Ubuntu 16.10 by following this tutorial: https:/
Then, after reinstalling and rebooting, just click on "Restore Defaults" under the "Window Spread" tab on Unity Tweak Tool.