I'm having the same problem. The site was loading very slowly for about five minutes, I signed out. Then when I tried to sign into my account it told me my username and/or password is invalid. It was like that for about ten minutes.
Seems like it's back to normal now, though. Except for this:
That's in one of the tavern threads. I didn't try to post in it.
I don't know if it's a maintenance. I think it has to do with something at AG HQ. Something similar happened like this a few months ago, and Cormyn said there were overheating problems, or something.
There's definitely something weird. The forum THREADS not the actual forums are loading really slowly, and it says at the game comments "Commenting will resume shortly!" (even though I CAN comment) And now there's the "Similar Games" thing that I see. That was there before, (right?) but I couldn't see it but now I can.
It was a problem with the database, but it's fixed now.
Unfortunately the down time lasted juuuust long enough to clear a bunch of stuff that would otherwise be cached, so please be patient while some of the forums take a few extra seconds to load.
Okay, so looks like there are some lingering effects. We have to restart our database, which will cause all kinds of weirdness on the site for a few minutes, but that should settle things down.