I noticed the same problem on my Inkpad, as well. I see it not only with pbimageviewer.app, but also with ordinary PDF and EPUB files as well. It seems to be a bug in the operating system or hardware. My PocketBook 902 and 623 don't show this problem. It would be good if PocketBook could fix it in a new firmware release. All we can do to "fix" the problem is to do something to make the page refresh (e.g. change the screen orientation, or tap to get the main menu and then tap somewhere else to close it, or go to the next page and come back,...).
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