I'm getting the same problem too. It's been happening since yesterday. Prior to that I had no problems at all. I use Firefox with noscript loaded, but the site is fully enabled .... AND the problem occurs with plain vanilla IE7 anyway.
I can access the character directly, but can't update. I can access my guild though.
I hope this helps debugging.
UPDATE: Even after disabling No Script, I still get no joy.
In IE I get the following error:Line: 25
Error: 'pageTracker' is null or not an object
Any chance of looking into this .... please