Sorry to be the party killer, but after upgrading to build 308 - the problem still persists.
After upgrading to build 306 I got this advice from your support:
Please close out of the program and go to Finder | Applications | Band-in-a-Box | Preferences and try deleting the content of the preferences folder but not the folder itself.

If you need me to post any logs, please let me know and I will gladly help.

I run a MacBook Pro i7 2.2 GHz - 16 GB 1333 MHz DDRAM on High Sierra 10.13.6


MacMini M1 - BIAB2021 - Logic Pro X - iZotope Music Production Suite - Scaler 2 - far too many Waves plugins and Line 6 Guitars and boards + a fantastic Yamaha THR10ll mini Amp - Avid MBOX Studio

Peters' Garage is available on all major streaming services