[SOLVED]Error 500 in Adminpanel

[RodNoc]

Thanks for the reply.

Oh.. Sorry.. I thought I would be clear with the information, that i did I new installation.

SO ? Do you mean OS? Debian Etch
ISPCP version ? RC7
PHP version? PHP 5.2.0-8+etch13 (cli) (built: Sep 30 2008 18:37:38)
Apache logs? without infos for the 500. version is Apache/2.2.3
How many domains? 31
What box you have (CPU, RAM dedicated/VPS)?
AMD Athlon™ 64 X2 Dual Core Processor 5600+, 2GB RAM, dedicated
Only in control panel? Yes, none of my customers told me about errors
When you log as admin/reseller/client/any? any.. but only when I change to users interface or back or change something like add new mailuser. (But this not every time)

Regards
Dom