I experienced the same thing today. I generated a solo and there was a complete measure of silence that did not fit the other background instruments. I highlighted the measure of silence and regenerated the solo (several times) until the sound fit. The rest of the solo part was not effected by this.

I have to say I was using RealBand to do this. I forgot what forum section I was reviewing. Maybe this info would help and still be applicable for BIAB.

I would hope that BIAB would do the same...

Mark