LibreOffice 5.2 menus are flickering when opening LibreOffice and while hovering the mouse over them. After a while the flickering fades away. Very annoying and nerve breaking. I guess it got something to do with loading the program into RAM memory. Is there anything i can do about that flickering? This doesn't happen in Windows or in Wine.
This solved it for me, on v5.3 / Windows 10 / x64:
I had this problem and had quick look into it. It appears that turning off compositing fixes this issue.
Settings Manager > Window Manager Tweaks > Compositor > disable "enable display compositing"