Thanks to all who replied with the great suggestions.

Unfortunately, after many tries to get the error message to disappear something worse has happened to this new system and I'm hoping someone may have an idea what's wrong and how to fix it.

A few days ago I installed the old VSC3 driver in an attempt to use it as a substitute for the GS wave table. I didn't actually intend to use it as I am using the VSC DXi for midi output but I thought it might stop that darned error message. It didn't so I uninstalled the VSC3. Shortly after that I noticed my RealTracks weren't working properly.

A file I had created with RealDrums and the two RealTracks Guitar, Electric, Rhythm BB (A only) and (B only) no longer played the guitar tracks. The title indicates they are generating but there's only silence. I even tried outputting the tracks as wav files but no files are created.

I tried re-creating the song from the start but the tracks still wouldn't play. I tried other RealTracks. Some work, like the Guitar, Electric, Rhythm StoneZ Flash (A only) and (B only). Other didn't like the Guitar, Electric, Rhythm Roadhouse A and B.

I've tried everything I can think of to get these tracks working properly again. I tried return to factory settings. I tried replacing the interface.bbw file with a backup copy. I tried a reinstall of BiaB over top of the existing installation. I tried reverting to MME drivers. The only thing I haven't yet tried is a complete deletion of BiaB and a fresh install. I don't want to go that route if I don't have to because of the time involved copying all my own and 3rd party styles and songs etc. I'll do it if I have to though.

So, do any of you have any ideas what might be causing this strange RealTracks behaviour? Thanks in advance.

BiaB 2013 b366, RB 2013 b4, WinXP Pro SP3, Toshiba M70, 1.8GHz 2GB RAM 100GB HD. Focusrite Saffire 6 USB, Ketron SD2.BiaB Wiki