I downloaded a bunch of free books as well as a few epub files via my Desktop Stanza from my Mac and I started reading one, closed the app and started it again at work, thought I'd continue reading - only to discover that the next book ... all the other books I downloaded to the library were gone. In fact even the one I was reading was gone from the Downloads section. I could still access it via the "Latest Reads" but essentially everything I downloaded was gone. I don't get it.

I'm using up to date iPhone 3GS + Stanza version 1.9.1. What am I missing here? How do I get to keep the books I download in the downloads library without having to redownload everything every time I want to open the app.