Strange behaviour of the UI

[Fonte Boa]

I'm not a hardware expert, but for sure this is due to video board driver. According the most frequent reports of this problem, usually this problem happens with on-board video devices. Other users here, more experimented in this issues, will can help you. It will help if you can report your video board, Nvidia or Radeon or intel generic on-board. If all used to be fined, probably something changed in you graphic settings... Sorry, but i cant be more useful than this...