I bought RealTracks Set 28 for Windows. I tried a couple of styles on a current track - Medium Jazz Waltz w/guitar and also piano.
To add drums to these styles just right click on the drum label, left click on find a drum sub, then pick a drum kit. This will replace the non-working drums with ones that work; see pic.
I hope this helps and good luck.
If you create a new song with a blank chord sheet with either of the 4 styles that come in set #28, the drum track is automatically populated with JazzBrushesWaltz: a: Brushes b: Snare, Ride
You should not have to manually add the drum track.
You need to let us know the actual scenario you is encountering with this quick test.
FoxTerrier do the following and let us know the results.
Open up BIAB and start a new song and make the style _JWLZ_BP.STY. You don't need to add chords at this point.
1. Is the drum track populated with JazzBrushesWaltz: a: Brushes b: Snare, Ride? If so is it colored green and is it playing when you start the single chord song? Under normal circumstances the answer should be YES
or
2. Is the drum track NOT populated with JazzBrushesWaltz: a: Brushes b: Snare, Ride.