I made the mistake of upgrading to Parallels 3 and Vmware Fusion Beta 4 at the same time and now I cannot run both at the same time. I am using an 8 core Mac Pro and upon starting the secone application (either Parallels or fusion) I get message saying that it is necessary to restart the machine. Is anyone aware of a fix for this problem? Both products are excellent and having purchase Parallels I also intend to buy VMWare fusion when the retail version becomes available. I will be very disappointed if I cannot get both to run together on the same machine.