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Old 05-04-2021, 12:41 PM   #12
deb27 began at the beginning.
Posts: 32
Karma: 10
Join Date: Jan 2010
Device: Kindle 2
Finally solved!!!!

I have 2 monitors. Using Windows built in "identify" feature, the one on the left is the primary (i.e. 1). The one on the right is secondary (i.e. 2).

If the Calibre window is on the secondary monitor, the ebook viewer will not open when I double click a book. If the Calibre window is on the primary (left) monitor, the viewer opens successfully.
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