I have defined a custom shortcut for mate-screenshot -a -c to take a screenshot of an area when I hit Super+Mod4+S (matching Win10's screenshot function)
It does not seem to work reliably, if at all - I can hit the shortcut 10 times and the cursor might change once.
How would I go about debugging this? There's no hung mate-screenshot processes or anything that I can see.
Hi @voltagex,
I done exact the same configuration as you (except that my side mate-screenshot do not take -c param) and it's working.
The only thing, is that i have a other key combination than you for the windows screenshot (Shift + Win + S) :
Insure that you didn't left capslock or something 
If you are unable to make it work this way, create a script like this :
sudo nano /opt/screenshot
Write there :
#!/bin/bash
mate-screenshot -a
make it executable :
sudo chmod +x /opt/screenshot
and inside the shortcut call your script with the key combination you want :
If it's still not working, I can advise you to install a other screenshot tool (like flameshot) and try doing the same as with mate-screenshot. If you still have issue with flameshot, means something is disturbing this shortcut to work.