I ran into a similar problem with borrowing a library book. The book was in ePub format. Initially I had no problem accessing it on my PRS-600 (got through abot 20% of it). I then purchased an ePub book from the sony book store. When I started up the reader again, I was unable to access the library book. Also, this was the only library book I had taken out at the time. Oh the joys of DRM...
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