Originally Posted by mark4asp
2. A recent book (bought last week) was not recognised as being in mobi format, the the file menu didn't even provide the option to convert
In this type of situation you should see one of two messages in the plugin's menu: 1) 'No suitable format to unpack.' or 2) 'Error encountered with X
being the format of the particular book giving you issues)
Are you seeing either of those messages?
3. The 3rd book produced no files, but gave an error message (below)
Looks like an embedded font issue in a KF8 book.