Infos popups auto-closing

Hello,

I'm currently testing PHPStorm with the current version.

It worked well for a few days, but now I have this strange behavior : many popups are closing as fast as they open. By "popup" I include boxes as changing branch, trying to open the "About" box, or even the auto-completion when I'm writing code. I can't even see what's happening, just a blink.

This last example is a problematic one : sometimes while i write code the auto-completion open, close immediatly, and I loose focus on the editor. I have to click to get my cursor back on the line, and it can happens at the very first letter I write.

This doesn't happen for every types of boxes, the more "window-like" as "Open" or "Find in path" have not this problem.

So far PHPStorm is great compared to my previous IDEs, but this suddent bug is a hard one. Do I have to reinstall the whole thing ?

For information, I'm using Linux Mint 18, and to say it again, it worked nicely at the beggining.