I have lost the BIAB audio a couple of times - once on a gig. Midi was OK but my RealDrums were not heard. Other apps played audio fine. I tried all sorts of things such as the Factory Reset, changing audio drivers, etc with no luck. The only thing that got the BIAB audio running again was a System Restore. I think Vista creates a Restore point every time the system is booted by default.

R