How to find *why* I can't bind some keyboard shortcut (or which app took it)?

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http://askubuntu.com – In short: is there (under Unity) any way to find out which application grabbed some global shortcut? I do not ask for "standard shortcuts" but for some way to get information about actual shortcuts (which app is actually keeping given key just now in my current config) Longer story: I have repeatable problems with managing keyboard shortcuts. At the moment: Synapse sometimes (*) can't bind Win-Space as it's activation shortcut, reporting "Failed to register hotkey 'activate' with signature 'space'" (what usually means that this shortcut is already taken) (*) After one login it works, afte (HowTos)