Same thing here. I went ahead and submitted a reservation request via email. Who knows, maybe they'll acknowledge the problem and give me a break. I know, I know, dream on.
I was able to get on the AP site after entering my info about 10 times...sigh. Just keep trying. But...even though I'm in I still can't get any rates as I get the same error everyone else seems to be getting.
Gosh you guys are helping me feel better. I was trying to book a reservation last night for the first time, and couldn't get it to work right. Now I know it wasn't something I was doing wrong!