You're not alone.
Only started a few hours ago which was quite a worry as I'd installed Dropbox between when it was OK and when it went south. So thanks for your post, for a minute I was getting worried I'd broken something.
I think it's the server capacity Sony assigns to the forums. They've had the same problem in the past, and solved it.
But with the release of Movie Studio 10, and lots of new users doing searches (which causes a big server hit), it may be time to encourage Sony to upgrade their server capacity again.