Hi Paul. I actually have tried both disabling and clearing but it made no difference, and I've since read in the documentation for the Keybinding.Disable method, "You don't need to remove or rebind a KeyBinding object before adding it elsewhere."

I'm certain it's possible to limit the scope of a shortcut to a single document with the CustomizationContext property; I do it often in other add-ins, and there are examples in the documentation for it (and I did it just now with a simple add-in to prove I'm not hallucinating...).

I'm tempted to pour all the code from the this add-in into an emptied-out version of one where it works.... I was just hoping for a revelation that would save me from that.