After installing Keyboard Maestro I now find I can't use the combined keystrokes of Shift + Command +V to post attributes in Final Cut Pro on my Mac.
That is because the hotkey Shift + Command +V is the default hotkey for the Macro "Activate Named Clipboard Switcher". You can either disable that macro by unchecking it, or change its hotkey to something else by clicking in the hotkey field and pressing a new key combination.
Or, if you don't need the Macro, you can simply delete it.
Thank you very much, that resolved the issue. As a complete novice to this software this experience has been a learning experience and has opened my eyes to the huge possibilities of it.