Thanks all for the reply.

Default synth was Uno Midi-Sport in/out. I don't usually set BIAB to use midi in but this time wanted to control BIAB from the external kb. First time I tried this and am wondering if something happened here. It did work at home just fine though.

All of the songs used the default bass channel with no special patches.

The receive channel on the synth was at the default of 1. I changed it to 2 and set the synth to bass and it worked.

The whole thing is a mystery. It seems like something happened when I powered down the laptop for transport to the gig.