Hi Raddy,
I'm wondering which version and build you're running. You can find out by clicking Help, then About Band-in-a-Box.
I'm sure you're using something older than 2018, but may need to install the latest update for whichever one you are using, as you should be getting a "Driver cannot do the requested conversion" when trying to make MP3s without a codec installed, not a crash.
You can get update patches here:
http://www.pgmusic.com/support_macintoshupdates.htmThanks
Kent
PG Music