The little tooltip when hovering over some fields in TeXstudio show solid black instead of giving more detailed information.
My guess is that this is related some java stuff - but I'm not sure how to figure this out? This is probably not necessarily related to TeXstudio but maybe to software compiled with Qt 5.5.1?
I'm on a pretty brand new install of Ubuntu 16.04. The same program runs flawlessly on my new Ubuntu 16.04 install on my laptop.