I could fix the bug on Ubuntu 16.10 by following this tutorial: https://www.computersnyou.com/4945/re-install-xorg-xserver-completely-ubuntu/
Then, after reinstalling and rebooting, just click on "Restore Defaults" under the "Window Spread" tab on Unity Tweak Tool.
I could fix the bug on Ubuntu 16.10 by following this tutorial: https:/ /www.computersn you.com/ 4945/re- install- xorg-xserver- completely- ubuntu/
Then, after reinstalling and rebooting, just click on "Restore Defaults" under the "Window Spread" tab on Unity Tweak Tool.