I'm not sure exactly what the problem was, but upon launching with Redsaurus' launcher in mavericks, MP and SP would just unexpectedly quit. If launch normally, the game would launch, but then you wouldn't be able to join 90% of the MP servers due to download errors. I talked to Red and sent him a screen grab of the error, and he spotted where the problem was in Mavericks and released an update to solve it. Now it runs flawlessly. The guy is a legend!