I am having this same problem. At first I got the error message as soon as I loaded the real track demo. I repaired permissions, and now it crashes as soon as I hit Play. The error message is:

CalcBeatAryAndSaveBT0 got called! File /Applications/BIAB/Real Tracks/Pedal Steel, Background Ev 085/RPS002.bt0. You may need to set System Preferences - Accounts - for Admin permissions for this account.

I have RW permission for the BIAB and Real Tracks folders. System and admin have RW permission for the Pedal Steel 085 folder.

I don't want to move BIAB into the folder for my user name - I want to leave it where it is.

How can I fix this?

Dennis