Hi

Can you share the book? The scenario you describe suggests that there's something 'wrong' with the book. Previous experience shows that sometime certain areas of a format are not very well specified, as result FBReader chokes on some files. (You can send it privately to me and I'll delete it after the investigation.)

One more question. You said that you have a few CHM books, do you observe this behaviour for all (or at least many) of them?