In case any crazy people who use old software like me stumble across this, I have used an old copy/paste manager called "Ditto" for many years, and never had any trouble until AI CC2015.3. I was just about to quit Adobe because simple copy & paste (or sometimes just copy) would freeze up and crash AI. Removing the Ditto app and changing the above SVG setting fixed it right up. Thanks for everyone's help!
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