Thanks for your continuing support, everybody.

I've got my colleague to run Juke Box on our common set of files, and he reports no problem.

He runs Vista on his laptop, and has just reinstalled Windows on a replacement hard disc, after his laptop fell off his music stand.

To that extent, then, my problem is solved, as I want him to use Juke Box to ensure that we don't suffer embarrassing hiccups when we use his laptop on a gig and we come to play a song I've edited on my system (which has a bigger selection of RealTracks installed).

I still don't like having an unexplained problem, especially when it affects both of my two computers in the same way.

At the same time, I'm also looking seriously at running BIAB under Ubuntu Linux (mentioned in a separate thread). I've got a MIDI-only installation running, but haven't cracked the RealTracks yet.