I'm posting this in case someone else has this problem and goes searching for an answer.

Band-in-a-Box 2017 does not start up in OS 10.13.2 unless you download and install Update 202 for Mac found here:

Mac Update 202


BIAB 2026 Audiophile Mac
24Core/60CoreGPU M2 MacStudioUltra/8TB/192GB Sequoia/Tahoe, M1 & M5 MBAir, 2012 MBP
Digital Performer11, Logic, Finale27/Dorico/Encore/SmartScore/Notion/Overture