What is getting displayed for the screensaver? The previous cover or something else?
If you replace a cover after the book has been put on the device, sometimes it doesn't get used immediately. The firmware is caching the covers for the current and recent books in memory and doesn't reread the image file until forced. Restarting the device will do this.
Occasionally, I will see a text cover used instead of the real cover. This just has the title of the book and the type on it and some boxes around the outside. Usually it is temporary and the next time I put the device to sleep it uses the correct cover. Occasionally it stays until I restart.
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