Thanks WhiteRider.
Nope I didn't install anything else. In fact I was using the PT that morning before installing SP2, then installed the update. As soon as I rebooted the system, I tried to open PT again and have been encountering the error since. I did as you suggested and enabled logging through the config file (although I don't believe anything is being logged, and I still have no 'PokerTracker.log' file in the 'Poker Tracker 3' directory. There was a 'PokerTrackerHUD.log' file there prior to enabling logging. Regardless, I attached that file along with the most recent log file in the 'Logs' folder in my support ticket.
It's worth noting that I am running the trial version of PT and have only been using it about 3 days. (Not a great start, I guess

)