Quote:

I have had crashes while BIAB was up (like for no reason I will see "BIAB needs to close", then
CRASH), but if the file is bad, I should be able to go back to the original, do a "save as" and make a fresh copy





All that crashing, you should do the Return to Factory Settings.

No telling what your intrface.bbw file looks like by now, it is likely corrupted. Return to Factory will rewrite it properly.

--Mac