Backend is blank but site is still working.

Today I went to post a entry and the admin or edit links from my page give me a blank screen. I have not made any recent changes. I tried in FF, IE, and Opera and get the same results. It lets gives me the login page but then goes blank.

I was able to post a entry using a bookmark: https://www.gwenandmike.com/wp-admin/sidebar.php
But I cannot get in to edit the post or anything else in the backend.

Any suggestions? https://www.gwenandmike.com