I was going to report this, but thought I should try it first. Muting an instrument definitely triggers the Save message on my BiaB.

These were the steps that were undertaken:
1: Start a new song (File > New)
2: Select a cell
3: Pressed <F5>
4: Muted one instrument (the Bass)
5: Selected File > New
6: Received the Song has changed alert.

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(This was using Build 1110)


BIAB & RB2025 Win.(Audiophile), Sonar Platinum, Cakewalk by Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Kontakt, Focusrite 18i20, KetronSD2, NS40M Monitors, Pioneer Active Monitors, AKG K271 Studio H'phones