Odd. FYI, I installed ElevenRack_1_2_1_Mac_83290.dmg from:
http://avid.force.com/pkb/articles/download/Eleven-Rack-Drivers

And I don't have my 11R connected right now, but it is the updated/Expansion Pack-enabled. I don't know if that matters. I understand how frustrated you must be - especially since it worked before. I'm new to all of this, so can't offer much more help.
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