Hi,
I've been wanting to use Calibre for a while and now I've finally given a shot to it. I copied all my files from my PocketBook library to my computer, and started adding them to Calibre, did some tweeks to the books (like downloading a cover page, converting to different formats), but to my biggest surprise, when I disconnected my ebook reader from the laptop, I could not open the ebooks in the reader (Pocketbook would detect them, but would not open them).
This happened irrespectively whether I tweeked with the file format or not, edited the cover page or not. Basically, even if I did no conversion to the original file, as I sent it to my Pocketbook via Calibre, the book could not be opened anymore. In contrast, when I just copied the EPUB, or whatever file, from my Windows library to Pocketbook, I could open them as usual.
I really don't know what I'm doing wrong. My guess is either that Calibre doesn't support Pocketbooks, or it has some problem with pirate books (which I *sometimes* happen to use

), or I'm just really lame to understand how Calibre works.
Can you please help me how I could find out what the problem is?
Thank you in advance very much!