I can't answer your question, but I do know that there's a very active Brother's Keeper mailing list at Rootsweb (
http://lists.rootsweb.ancestry.com/index/other/Software/BK.html). There are lots of knowledgeable users who answer questions, and John Steed, the program's author, joins in as necessary.
A quick search in the list archives (link near the bottom of the page) suggests that a few people have had similar problems, though none very recently. If the archives don't help I suggest joining the list and asking there - or you can contact John Steed directly via links on BK's own website.
Arthur