My roommate directly to my right has been logged in and playing on multiple servers for half an hour now. Mine has refused to bring up the realm list for that entire time, including after restarting my machine. It's really starting to piss me off.
Edit: Thanks for the copy/paste, Barnie the Brilliant GM. It has nothing to do with the realms being up or not, and you know it. There are tons of people logged in.