I used to see a lot of ghosting when I first got my Inkpad, but I haven't noticed the problem after upgrading to the 4.4.1277 version from the website. I'm referring to ghosting in the built-in readers and pbimageviewer. I haven't used koreader in a while since I'm happy with AdobeViewer.
I think the problem with the page flashing after 5 minutes and becoming unresponsive is common to many PocketBook models. I've noticed it on the 902 and 623 as well as on the Inkpad. I think something is being put to sleep. It usually takes a touch to wake up the device before you can use the UI after that flash.
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