I am sorry for not following up yet, but I couldn't play with BIAB last night. Will definitely do so tonight.

As I was thinking about it driving home, I recalled I experienced two manifestations of the problem: total erasure and a partial revert. For the latter, I had changed a chord to its tritone sub, and subsequently tried fiddling with repeats. When I cancelled out of that, the chord reverted. But I will try to replicate that to be certain that's what happened.

Two things: I used to be in the software-maintenance business for the Navy, so I have great empathy for those who have to track down these bugs, especially considering all the versions of BIAB out there and all the different HW configs that exist. I also understand how important it is to have a good test case, so I will try to thoroughly document my system and the steps taken to induce the error (as best I can).

Second, people here at work always say that if you want to *idiot*-proof something, then give it to me, and I'll find a way to break it. So, I'm not *just* a noob! <grin>