Quote:
Originally Posted by jwlewis
I took your advice and deleted sigil-ebook folder in the AppData/Local folder. Sigil instantly appeared on the screen and now all is well again. It took me a long time to locate that folder as it is hidden in the Users directory. 
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Keep a backup of
Sigil.ini, corruption of that has been a problem in times past. Restore that and you usually are good to go again. (no need to remove the entire folder)