"Failed to open midi support library". What is missing? And if so, how do I get it back? What to do?

I own a new Macbook pro 15" quadcore with OS X Mountain Lion 10.8.4
When trying to start software Reason 7 I only get the message "Failed to open midi support library".
What is missing? And if so, how do I get it back? Reinstalling Mountain Lion did not solve anything.
What may I do? Is there separate MIDI-drivers or else that Macbook needs to be running audio at all?
My audiocard Apogee Duet 2 is´nt working well either and I cannot even open the MIDI-window in Mac,
so that road is blocked. I´ve seen more ppl having problem but found no explaination.
Some say to remove midi-drivers but that folder is empty (or hidden?) when opening.
Also, Garage Band cannot open. It´s no problem with graphic apps, only with audio/midi.
My 2011 Macbook pro13" with OS X Lion runs like a charm. So how can this be? It really puzzles my mind.
Have thoughts on having OS X Lion on the new Mac as well but will not do it until I know where the real problem is.
Hope there is an easy fix to it. Thanks in advance.

When I use find file http://www.macupdate.com/app/mac/30073/find-file (which does tend to find files that "Finder" can't), it's not coming up with any other itunes library files that have been modified in the past week, which I know it would have been - unfortunately, I don't have a very recent backup of the hard drive.  It would be a few months old so it wouldn't have the complete library on it....any ideas?  I'm wondering if restarting the computer might help but have been afraid to do so in case it would make it harder to recover anything...I was looking at this thread https://discussions.apple.com/thread/4211589?start=0&tstart=0 in the hopes that it might have a helpful suggestion but it's definitely a different scenario.

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