How do you diagnose why a keyboard shortcut does not work? I am trying to get Command+Alt+Shift+L to work in RStudio on OSX. I have a large number of customisations that might possibly prevent this shortcut from working. I've gone through the usual places (e.g., system preferences - keyboard; Alfred; Better Touch tool). Thus, I thought there might be some more general procedure for working out what program, if any, is intercepting the shortcut

Is there a way of seeing what program might be intercepting a particular keyboard shortcut?
There is app called KeyCue that will help you find the keyboard shortcuts in use by your system.



It is shareware.

More info and to download : http://www.ergonis.com/products/keycue/