You can simplify this by just focusing on one of the missing files in your screenshot:
RElGt046.st2
This is associated with RT#694 (Guitar, Electric, Rhythm ElecRockArp Ev 120) from "set 48" and is included included in the UltraPAK.

The message is telling us that the .ST2 file is missing. Can you confirm this? Look in /Applications/Band-in-a-Box/Soloists and see if it's there.

Also, if you look in the RealTracks Picker, check the box to "Show N/A", and then look at RT#694, is it listed as "N/A", or "N/A RT Folder" or "N/A ST2"?


Andrew
PG Music Inc.