I've noticed a hiccup. When putting a song together, I found that if you did a song in 4/4, then added a 2/4 bar with a hold or a shot in it, then change back to 4/4, the instruments (except the drums) will not come back in on the one. They usually don't come back in until the shot or hold has run a full four beats. So it would be (for example):

4/4 2/4 4/4
Eb Bb.. Eb

I tried it with numerous styles at numerous tempos, and it's always the same result. Let me know if you can replicate the issue.

I'm currently using BIAB 2021 on Windows 10.