Quote:
Originally Posted by Giuseppe Chillem
I have only a supposition: I have moved from dual monitor to single monitor due to graphic card failure. Is there a chance calibre is opening some window where I cannot see it ?
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Other people have reported behavior like this. The window icon should still be on your task bar or whatever it is that your system uses. For windows, you can right-click on the icon, select 'move', and press the arrow keys to move the window from the non-existent screen to the visible one.
However, as user_none said, do wait a while. There are a lot of database upgrades going on.