I've seen this happen a two or three times, and it was always caused by sending Calibre to the tray. Either via checking Preferences->Look and Feel->Enable system tray icon or via a 3rd party Windows utility.
If you use the setting in L&F the calibre icon will be shown in the Notification Area (Tray), to get it on the taskbar (near the clock) you have to adjust the TaskBar Settings.
Because Calibre advertises itself to Windows as "The calibre main program" users didn't see it in Task Manager because they looked amongst C's in the Background Task list, so they rebooted the computer.
In the case of the 3rd party Minimise to Tray utilities there was no icon - on the taskbar, in the 'Tray', or near the clock - i.e it was no place it could be seen. Could be a Qt 'thing', because Sigil's the same - solution disable Minimise to Tray in the utility for Sigil and Calibre.
BR
Last edited by BetterRed; 10-31-2019 at 04:41 PM.
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