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As a follow-up, I did wind up re-installing the software and everything seems to work.  It was pretty the last thing I could think of to do.

I am having the same problem and am going bat-crazy trying to figure out how to resolve it. Here's some background: I'm running on a new 27" 4K iMac which replaced a 2009 iMacIt is running Yosemite, 10.10.5I transferred all previous files, applicatio...