Mainstage 2: Suddenly no midi signal

Im running Mainstage 2.1.3 with Lion 10.7.5
Hardware is: Malletkat Pro (midi keyboard) --> Mbox 2 -->Macbook
The concert is setup and running smoothly when suddenly Mainstage no longer recieves midi signal. Mainstage is not frozen, it simply stops registering a signal from the keyboard. Restarting Mainstage fixes the problem.
Thanks for your help!

Obviously this poses a problem since I want to use the setup in a live concert...
Thanks!

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stage5VmotionInputs.vi ‏187 KB

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