I had the same issue occur for me again, btw - this time, with *only* DRM'd EPUB books on the reader!
I returned all the PDF DRM material, synch'ed the reader, and confirmed that EPUB library books would open; then I checked out & downloaded some new EPUB material ... and was p|553d to find that suddenly all the drm'd EPUBs were inaccessible - also confirmed that no drm'd PDF was on the reader nor in the PC's library.
Re-downloaded one of the drm'd EPUBs, and then everything was working ok - until the next time this breaks. sigh.
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