Something very strange is going on with this site. I login, go click on Posts or Pages and if I want the All Posts or All Pages button and I get looped back to the login screen. If I want to add a post, I can do that. I just can't look at all my previous posts.
If I switch themes, which I did going back to Twenty Eleven, I get a 404 page instead of the loop. Turning off plugins did nothing.
I've never seen anything quite like this. Has anyone else?