I actually had the same issue on my Cruz, but
now I have a Kobo and am experiencing the same issue.
I bought a book in PDF format from the Borders.com website.
I was able to download it and I CAN view/read it on my laptop.
I have transfered the file numerous times into numerous places on my Kobo,
but it does not show up as a book. My suspicion is that it has something to do with the
licence file. That is in there, but do they both need to be in a particular place? I really want
to read my book, and I know it is in there somewhere.
I assume my Kobo is authorized as it shows up as a device in my Adobe Digital Editions.
If anyone can help I would appreciate it.
I can attach screen shots too if that would be helpful.
PDF's show up under the DOCUMENTS. From the I'M READING screen, look at the small BOOKS * DOCUMENTS above the book you're currently reading. Scroll up then across using the cursor, then press the center; you will see all your PDF files. Very confusing the first time. Note: I transferred various PDF versions of user guides here, using Adobe digital editions (add to library then transfer to Kobo), now I have my cell phone & camera guides with me all the time. Good luck!