I am running a fully updated Windows Vista x64 Business edition on the primary PC, and Windows XP Media Center ed. on the secondary.  Both are running Multiplicity Pro 1.21.  The ability to cross to my secondary screen with just a mouse movement is not working.  I have tried several configurations, and the only one that seems to work is using Scroll Lock to swap screens - then I can swap to the secondary by pushing scroll lock.  Once on the secondary computer, scroll lock does not switch back, instead I have to flick across to get back to the primary.  (also, I just noticed that it thinks my secondary PC is to the left, after changing it to the right side).  Is this just a bad install? Should I remove it and try again?

The same computers work just fine when I run XP Pro on the primary.