Previously, my laptop used Ubuntu 14.04 without trouble, but after passing to Ubuntu 16.04 (not upgrading, but formatting), I've some rendering problems. Since I cannot put here specific details because I don't know what is exactly happening, I'm searcher for the error yet.
My current assumption is that, the rendering issues are only affecting gtk applications (for example, some PDF images are being rendering poorly in
evince, but not in
What I want to know if there's a way to know, in the easiest way as possible, if an application is a gtk or Qt one, to open different applications, see which shows bad rendering, and which library has been use to build that software.