Hey Mr Packer!
Well, this to me would suggest a conflict of sorts - which is rare on OSX. Can you try connecting manually via the 'telepone' remote connectivity icon in the top bar? This is a bypass, as opposed to a resolution, but might be an idea until you discover the root cause.
Other than this, is your VMC app in the default Applications directory? It sometimes throws a wobbly if not placed properly
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Daz
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