Thanks all for the swift replies!

Yes, I had updated to 1108 before reaching out to support. That patch fixed a few other quirks I was having with both BIAB and RB but not the spontaneous song opening shut down. Just for context, please note that while I may be new to posting on the forum, I have happily used BIAB for decades, and as an IT guy with close ties to software Dev/QAT, have found the product to be remarkably stable and well supported over that time. Please keep reminding me of the basics though, as I find my blind-spots so often appear where I should have known to look...

Tonnie, Noel - the combo of non-frozen tracks, fixed _SLACKS seems to lessen the likelihood either is the underlying culprit (though maybe in backroom cahoots).

Audio, I was attempting to change the key from Bb to Am and in fact, was able to do so this morning :-/ I was able to regenerate the song, and freeze all the tracks, and save/reopen the file (despite several attempts at these very same steps prior to my original post). Given these observable inconsistencies, something more application-state-specific must be in play (though I am currently swimming in a school of crimson herring).

What remains consistently reproducible is the crashing of BIAB upon loading of the original problematic file(s). Attempting to eliminate variables, I switched my Audio from ASIO to MME, but the app still closed when attempting to load the original song files, so hopefully that test precludes driver mischief.

Unfortunately, I don't get to spend enough quality time with BIAB, so unless I find another example, hear from support that this is a known issue affecting a wider audience or can consistently reproduce the problem with a new song file created in v2024, I'll probably just cut my losses and recreate the original song from scratch. I will certainly reply back here if support provides clues or I make any solid discoveries.

I appreciate all of your feedback!

Kind regards,
Inki