I didn't change anything in the handling of these formats from the sources provided by PocketBook. Two questions:
1. What does the configuration of fbreader show for the hyphenation language for these files? It should show e.g. "auto (en)" if it detects English.
2. Can you send me (e.g. by board mail) a sample file which causes this problem? I don't have such problems with any of my files...