Just kidding... We had a corruption of the user's database that caused the "am I banned" field to be set for everyone. This didn't immediately affect everyone at once because of caching in the system. This is why it took me a while to notice myself. I was able to fix it by deleting and reloading the user's database from a recent backup. No data was lost in the process unless you created an account in the last day (very few accounts). Sorry for freaking everyone out!