I've attached a screen shot of what I get. I literally just get the OS X Guru menu, but no actual Guru window. Now here's the interesting bit: I am able to run Guru just fine inside of my Logic 7.1 host. I am running OS X 10.5.5 on an Intel MBP.
I followed all of the instructions above to a T. When I try to load Guru, it "loads", whereas before it had been asking me for my serial number. However, the actual main application window never appears. I just get a Guru menu and that's it. Frustrating.