I have that problem on Windows Server 2008 R2 (x64) too. Many others have it as well. I've only been able to get it working on XP x32.

Shadow and I tried about 6 months ago to get to the root of the problem, but we never figured out the cause (and without having the source, we can't even attempt to fix). It always crashes at a very specific point, if you observe the devicator console window as you join, but that's all we got.