I'm not trying to be difficult here but it's a fresh install of Win10 with calibre, Firefox, Chrome, Notepad++ and Adobe CC installed. I know it's weird but imagine my surprise after doing a fresh install on a PC on 10/6 to download calibre and find out it's now hit v4.0. Oh, Dropbox (gotta keep that library synced). It is not working properly. For good measure, I went in the preferences. Reset everything to default (I hadn't changed anything anyway) restarted calibre and still no ALT+TAB / Winkey+ TAB / double ESC to exit out of the viewer. Wait WinSCP, PuTTY, Keepass. I went and checked this time. JIC someone tried to blame it on something funky.
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