It's truly unfortunate that none of the issues reported in this thread have been detected and corrected preferably during the long period the Beta version of Big Sur was made available or alternatively immediately after its release, as it happened with pretty much all the other programs I own for Mac.

BIAB is not only (and by far) the most expensive software I have but it is also the one I use professionally on a daily basis. Having been afflicted by pretty much all the situations mentioned above and despite my tolerance to all that magenta and the partial and temporary fix of deleting the preference files, in its current state BIAB is not reliable and surely not fun to use.

So I'd like to leave a strong word of encouragement to BIAB's developers in the hope that very soon they'll manage to fix it so that we, the paying customers, can go back to a trouble free usage of this wonderful software.