And so now I just re-re-reviewed where the RealTracks/Real Drums were expected to be found, expecting to see that BIAB was looking appropriately to the BB folder in the D drive, as they were earlier. But the fields were blank. So I've now re-pointed them to the correct directories on the D drive and all is well.

So it appears my original problem was somehow this morning BIAB was using the WAS driver and as I tried horrible things like returning to factory settings and reloading I'd somehow simply wiped out the field that points to the Realtracks/drums files on the D drive. An interesting aspect of this is, at least on this machine, when you try to use the WAS driver BIAB stops. Must be waiting on something?

Anyway, I just knew this was somehow something simple I was overlooking. I've used this program for many years here at home and on live gigs and once again I've proven to fail it far more often than it's ever failed me.

It's a great program and since the pandemic an important part of my day-to-day life. Thanks to Chantelle and all the others at PG and your all out there for your support and help.