Hmmm.. I know i'm not being all that clear there, but I can't remember just what works with what and how, whilst i'm sat my desk with no copy of it in front of me.
Anyhow the point I was working towards is that sometimes when you shut down cubase it fails to release the audio drivers in the background, and then when you open up another media player it'll work but the sound card won't output due to Cubase still holding on to it's driver.
Pain in the arse sometimes, but a reboot sorts it.
ScanProAudio & 3XS Audio Systems