Internal server error!

[johnjohn301]

I get this error when I try to visit the photoplog index page:
Content visible to registered users only.

I aslo get the same error when I try to access
Category manager
Add new category
Moderate files
Moderate comments

Please help!

[Morgan]

Look for any htaccess file, and if present, temporarily remove, and see if the Internal Server Error goes away. Also take a peek at your server error log to see if more information about the error is present.