Everything is in the default location on the internal HD.

Thanks for the suggestion, but booting in Safe Mode didn't help. I just booted into SM, then rebooted into standard mode, and before opening anything else started BIAB and hit the Song Picker. Instant beach ball. I do occasionally get popups like ""Band-in-a-Box" would like to access data from other apps." which I take as a sign that something is working behind the scenes, but like I said, it remains frozen for hours, forcing me to force quit.

Could it be an issue with going from 2024 UltraPAK to the 2025 PlusPAK? Should I have just spent the extra $ for the 2025 UltraPAK upgrade?