[home] gives blank page

[webunity]

Whenever i log in as a client on my plesk 7.5.3 reloaded i get a blank page as soon as i click on "home" (to get my list of domains). Thesame happens when i log in as an administrator and click on the "domains" page.

I allready did a full restart of psa (e.g. stopall / start) but nothing changed. It only happens on the "domains" page.

Can someone please help me!?