I have deleted the previous Calibre install and all associated files. I clean reinstalled Calibre 5.03 and on completion it failed to open the first time I clicked on the icon but opened subsequent times. When open if I click on an epub file it loads it into Calibre. When I close Calibre and click on an epub file the Calibre icon bounces a couple of times and then stops without opening Calibre or loading the epub.
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