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Hi
That’s weird, that’s the first time I read such a issue.
I suggest you try the following :

– Disconnect Xkey
– Open audio/Midi utilities, MIDI devices window
– Select previous Xkey device(s) and delete it.
– Open disk utilities
– Repair disk permissions
– Re-connect Xkey

If you still observe the same issue, please try to connect your Xkey to a different computer.

Let me know if this helps.
J