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Did you delete the library books before re-authorizing the device? If not then the cover images might have been generated while the device was not authorized, which won't work properly if the book has DRM. A factory reset would delete all the books, but signing out won't, which might explain why the factory reset fixed the problem.
If you reload a book without first deleting the old one, then the database can in some cases (if the file name and size of the new book is the same as the old one) have data from the old book which doesn't match the new book. That can cause all sorts of strange things to happen when navigating the book. Best thing is to always delete the book from the device before loading a new version.
You can avoid the need to re-authorize the device after a factory reset or signing out by making a backup of everything in the device's .adobe-digital-editions directory and then restoring it afterwards instead of re-authorising the device from ADE.
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