I've been having exactly the same problem for several weeks now. I followed your instructions, found 'show hidden files' was, indeed, un-ticked, ticked it and ... suddenly ... nothing happened. The problem persists. Like Doug, I've uninstalled, re-installed and tried a whole bunch of other stuff until I'm blue in the face. Still no source view, so I can't drop books into my PRS-505 and the entire library's currently redundant. Darned frustrating because there are dozens of titles in there I really want to read. So it goes.