Does not work with your own epubs

I bought the Vbookz app expecting that I could import my own ePub files and have them read to me. A previous reviewer suggested to use calibre to convert non-drm protected books into the right format (epub). I tried this and copied the ePub file via iTunes into the app. Vbookz recognizes the file and opens it, but each chapter of the book I was reading showed only the first page of that chapter. When syncing the same file to iBooks the whole chapter is visible. I will now use the VoiceOver feature in iBooks instead.

T.orko about vBookz Audiobooks, v2.5