A couple of additional thoughts...
1. Are you running the latest update? We're currently up to 628.
https://www.pgmusic.com/support_windowsupdates.htm2. If this problem has appeared after installing the latest update, try download a previous update, install that (it will overwrite the latest update) and see if that makes a difference.
Also, in this instance this is something I'd try, the ultimate factory reset is to go into "bb\Preferences" and rename "MySetup.DK" and "intrface.bbw" to something like "MySetup.DK.old" and "intrface.bbw.old". This effectively deletes them and forces BIAB to make new versions of these files. (By renaming them, it's possible to get them back if needed.)
Regards,
Noel