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No idea about the "why" but I may have an idea "what" is happening:
I had comparable issues when trying to open certain PDF files (which we by now know to sometimes crash the Cybook).
The unresponsive behaviour is due to the fact that the Cybook has already crashed. Because of the eInk technology used your screen doesn't just go blank when it crashes but leaves the last seen screen displayed. So when you try to press buttons nothing happens because the book - even though you still see the page - is in fact already switched off (this includes pressing the reset button which just clears the memory but leaves the device switched off).
If you then try to switch it off, you actually switch it on (because it was really already off).
I know this is pretty confusing in the beginning (took me some time, too) but I hope to have helped clear a few things up.
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