Did you download UOAM or the new Cartographer? UOAM is no longer supported and, since the release of SA, crashes on update for me so I can't even use it anymore.
Cartographer, however, runs nice and smooth. But it does require UOAssist to be running if you are running the 2D client. Now, here's the key, you can download UOA and run it but just not register it/pay for it. You won't have access to the functionality but Cartographer will work. This might be the problem if you are using 2D.