Logic Pro 9 lost MIDI connectivity

#1
I'll be happily playing MIDI regions in on cycles, and when happy move to the next few bars and play in some more and so on.

However, every so often, although I have the correct track/instrument selected, playing my controller keyboard gets me silence and I have to stop my workflow to troubleshoot.

The problem is solved as soon as I click on another track of the same instrument.

Why does this disconnect happen and how can I prevent it happening?

pete
 
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