Hi Andrew, I followed your advice and downloaded / reinstalled RTs 278-280 and 329-337 from my account. I did carry out the same procedure (exclusively for RTs 329-337) at least 3 times during the last few weeks. It looks like reinstalling RTs 278-280 has helped , but my main problem with unavailability of RT 3114 bass rootsyfunk remain unsolved.
This will check RealTracks installation. For a RealTracks to work, there needs to be a ST2 file in BB folder, and a folder of WMA files in the RealTracks folder set in Prefs-RealTracks Settings.

RealTracks Configuration ERROR: RealTracks # 3114(Set #800). RealTracks found here C:\bb\Soloists\RBass252.ST2, but RealTracks folder not found here: G:\bb\RealTracks\Bass, Electric RootsyFunkAlex Ev16 110\. Use Prefs-RealTracks Settings to set correct RealTracks folder.
Number of RealTracks ST2 found in BB folder = 2887
Number of RealTracks WMA folder found in RealTracks folder = 2886
This will check dates of Bt0/bt1 files compared to WAV and WMA files in RealTracks and RealDrums.
Drums WMA - no date errors
Drums WAV - no date errors
RealTracks WMA - no date errors
RealTracks WAV - no date errors