Admin CP is inaccessable
 

We are using PP at http://www.artisticalley.org/gallery/ and have been for years. Last weekend, for no explicable reason, our admin control panel became completely inaccessable; people can still submit art, and post reviews, and view everything, and we can administrate from the site's public pages and even access the "admins only" forums, but we can't get to the Admin control panel at all. If I try to get to said page, it takes me to the login page, and then, nothing.

Is someone able to help us with this?

What do you mean it is inaccessible?

You might need to PM us an admin login

You can see at http://pics.livejournal.com/heidi8/pic/000c4ye4/ what it looks like - it's recognizing my login as an Admin-level user but not loading anything ont he Admin page. However, as you can see at http://www.artisticalley.org/gallery/ everything else works. All that seems needed is a reload of the correct version of the back-end for the Admin section, unless there's a chance that we can fix using FTP to make it display properly.

It worked until last week.

I would suggest try using clean files incase maybe something is corrupt.