Originally Posted by THE TERMINATOR
Why would you convert a perfectly good E-pub into a PDF? Readers aren't really meant to read PDF's they are documents not books. As for the blank pages or black? I had that problem once as well, and I don't know how to fix it.
My guess would be because they're in another language. So far, Kobo only supports EPUB in English- but if you could convert them nicely into a PDF, they'd become an image file and it would no longer matter what language they are.