This is the first time I hear it, but I own my Pocketbook only since a few months. Which version of the software are You running?
And what happens if You touch the book for a while and then it pop up the menu, and You choose to read with a app (I can choose between Epub 2 and Epub 3, other than Koreader)?
The next time it should open the book with the app You have previously chosen.
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