Well, I tried removing and re-installing it and it was just the same.
So I removed it again, downloaded Beta 11f and copy/pasted that into windows/system32 and it showed in the Screensaver list as per normal.
However, its just the same, the music doesn't play from the music play list (or when the aquarium is running) and when it quits it stays in the task manager list. I ended up with several copies running again. Grrr.