Actually, it is possible for me to access a number of pages in the User CP:
http://forums.graalonline.com/forums...do=editprofile
http://forums.graalonline.com/forums...=editsignature
And more.
It seems like only the main User CP page and the PM page are down.
Edit:
Trying to think of something in common with all the pages that aren't working, it seems to be anything involving PMs or visitor messages.