It seemed strange that when I first loaded up UDK that Speedtree worked fine. Now as many of you have pointed out, it doesn't initialize. All the rebootos, open as admin etc., in the world wouldn't help and yet I see some of you are using Speedtree. So are you all using the downloaded demo or the one that came with UDK? I hope the Speedtree team worked or has worked this out, they did a great job.