Error 500 after login

[jjroman]

After I submit the login form I have a 500 error Page and I press F5 and the panel works after this. Is there any way to solve this problem?

 

[Leonardo Angelini]

I have same problem :-(

 

[IgorG]

Did you try to find more details for problem reporting? Error logs, related errors from Event Viewer, etc?

 

[NeuroPsyche]

I get this error everytime I try to load/install an API application.

The applications that were installed in prior < Plesk 10.x (Plesk 9.x) seem to work, or show up.
When I try to install new API applications from Vault it gives me 'Server Error 500' after I press the NEXT button after agreeing to terms.