Problem with interface refreshing in PhpStorm

Hi,
since the last version 2.1.2, I've been having alot of problems with the refreshing of the editor interface when i pass from one program to PhpStorm. It get's really instable, only refreshing the parts where i pass with the mouse. Only after a while after minimizing and maximizing a couple of times... or sometimes a need to restart PhpStorm.

Any ideas how to fix this?

thanks