OS X Midi services not available

I've been getting this message intermittently since upgrading to Logic 8.
I've trawled the net and all the sollutions I've seen are related to
removing midi drivers...I don't have any installed and I'm still
getting this message.
The only work around I've found is to quit Logic and then reload and
eventually it'll start working again.

I'm not sure if I would get the message if I was running without TDM
as all my sessions are with TDM running and as it's intermittent it's
not like I can quickly test it.

Anybody able to help with this ??

The message is sometime preceded by a message that warns of a possible
conflict of third party midi or audio drivers....I've looked in what i
think is all the obvious places but can't find anything obvious.

Heeelp !!!!



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