SAP GUI only black after Upgrade

Hi

I upgraded from 7.10 to 7.2. After the upgrade I only get a black sceen where the SAP GUI should be. I can only see some text and when I'm in a text box I just see a red squere representing the input area.

I have tried to uninstall the gui and install it again. But it did not work.

Is there any things that I need to reset?

Daniel