Sorry
I think my translation is buggy...

I didn't mean that tracks were deleted without my wanting it, but rather the opposite...
It often happens that I can no longer delete a track or replace the instrument of a given track. And in this case, BIAB refuses to do so without indicating why.

I have not really identified the path that leads me to these problems, but it happens to me frequently. At first I reported it to the support, but I ended up giving up.