So in the top right hand corner of the screen can you see something like

Hi, BMPOWER

?

You might have some kind of cookie/browser cache issue. If you clear your cache and restart the browser that might work.

http://www.library.cornell.edu/newhelp/technical/errors/answers/clearcache.html

You could also try deleting cookies.

It must be something local to your machine or there'd be a lot of other people letting us know something is broken.

If you want to stay logged in you have to set your browser to accept cookies too

hope that helps

-zachary