SOLUTION (sort of..): Found a fix, although I don't understand it. I had to change which NVIDIA driver I was using.
From... Using NVIDIA legacy binary driver - version 304.131 from nvidia-304 (proprietary) ... to ... Using NVIDIA binary driver - version 361.42 from nvidia-361 (proprietary, tested) To change this, I went to Software & Updates > Additional Drivers (Tab). (I also posted this on Unix & Linux Stack Exchange - http://unix.stackexchange.com/questions/279169/why-cant-i-click-between- windows-after-xenial-16-04-update/279484#279484) -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to evince in Ubuntu. https://bugs.launchpad.net/bugs/1574800 Title: Cannot switch between windows by clicking or click OS-related UI To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/evince/+bug/1574800/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs