Forum when want to change any option on admincp, i get Forbidden error
 

I get this error when i want to change any option on admincp (for example, maintain message):
Quote:
Forbidden

You don't have permission to access /foro/admincp/options.php on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

Apache/2.2.15 (Unix) mod_ssl/2.2.15 OpenSSL/0.9.8n DAV/2 mod_fcgid/2.3.5 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 Server at www.experienciaue.net Port 80



what is the problem?
i have tryied to change option.php permissions to 777 ..disabled all plugins but problem still

help please! :confused:

edit:
a user is getting the same error but he is trying to edit a thread:
http://img197.imageshack.us/img197/407/kodio.jpg