Please, send an email to support@geometerplus.com. Don't forget to mention platform you run FBReader. If the issue is specific for some book (and if this book is not copyrighted) please attach the file.

We do read all incoming emails. Unfortunately we have no special person to reply the messages. If you do not receive a reply this means we do spend our time to fix your issue.

B stands for Book. As for F we have several suggestions: Free, Fast, Famous, etc.