Hello,

Quote:
Please when you send an error message made it easy to copy, don't make it disappear too quickly, and made it more understandable (if possible).



Yes, you can review and copy all of these messages by going to the Help menu | Utilities | Display Log text file.

RealTracks #2557 is part of 'RealTracks Set 263'. (you can tell this by looking at the Set column in the RealTracks Picker). So if you missed intalling that, just find the installer series that contains that set number.

Take a moment first and download/install the latest patch:
https://nn.pgmusic.com/pgfiles/support/patches/bb2020_mac_update_build403.pkg

If you look in /Applications/Band-in-a-Box/RealTracks
Do you actually see the folder "Cello, Background SlowWaltz Sw 085"


Andrew
PG Music Inc.