Please download beta 5. I added a delay to avoid this problem (not documented in the change log).
Basically when restarting the device the program first turns it off, then it turns it on again. I added a delay in the middle. If this keeps causing problems I'll need to make this feature optional, and go back to the continuous add-modes->restart hell cycle. This is only needed for legacy cards however.
Sledge, if you see the issue again, instead of reinstalling the driver, go into device manager and re-enable the video card manually.