Can't install phpstorm, only white screen

Hello,

I'm running Ubuntu Server 18.04 with the XFCE desktop environment.

I'm trying to start phpstorm using ./phpstorm.sh from a fresh stable install, but I only get a white window: (I canceled the "import settings" window already)

The buttons are there and I can click on them, but I can't see anything else.

I never had this problem in the past and I don't know what I should do.

Thanks for your help!