Midi stops working in Logic 9.1

When using Logic 9.1 I have been having midi crashes that require me to restart Logic. All Audio files will still play but I cannot play any 3rd party or Logic softsynths. I am getting a midi signal from my keyboard to my MOTU Ultralite interface but for some reason Logic does not respond to any midi signal. It usually works after I force quit Logic and restart. Any ideas what might be going on?

I also have this happen sometimes. The best way I have found to get the Logic Control back online is to turn it off, then unplug my MIDI interface USB conection. OK through the two alerts that come up, reconnect the MIDI interface and power on the Logic Control. This can all be done while Logic is runnning.
By the way, I have an original Emagic Logic Control with the upgraded EPROM chip and version 2.1.2. I also had the same trouble when I had the original EPROM and with each software version since the first.

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