Ubuntu: Why do my windows occasionally stop taking keyboard input after alt-tab?


I have recently installed Ubuntu 16.04. Two different applications (Vim and Awesomenauts), on different occasions, have started completely ignoring keyboard input - though mouse input still works.

This goes away after opening a new instance of the program. I am not aware of the precise circumstances of it happening, as it's only happened twice, but I believe it may be just following alt-tab to switch windows.

What could I have done to cause this behaviour?


It turns out the shortcut Ctrl-S freezes keyboard input. This can be undone with Ctrl-Q.

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