I have noticed that on several occasions. The closest I come to be able to reproduce the issue seems to be when I resend a book from calibre after editing it. A power cycle (power button or reboot from NickelMenu) seems to fix the issue until the next time.
And yes, once it is triggered, it seems to be there for any epubs until I reboot my Sage. Nothing like going back to a book that you have read 63% of and being told DRM prevents you from reading it.
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