One core peaking after 10.9.3....annoying clipping sounds

Using a 12 core mid 2010 32GB RAM. This is what my core reader looks like when I'm doing nothing....on a blank session (screenshot). If I start auditioning string samples (Spitfire, 8W Black, Symphobia ect...)that one core peaks causing very annoying clipping sounds. I didn't have this issue on 10.9.2 and after the awesome Logic X update that spread the load across the cores (finally).
Please look into this as I'm sure Im not the only one with this issue. My computer and using Logic X is how i make a living. Freezing every track is the only work around this, for now....

Just to follow up:  I started looking for things on my MacBook that could have had an impact on this behavior.  I could think of three:  App Nap, and two third-party products I run, App Tamer and Little Snitch.  I turned all three off, and the problem went away.  So you'd think I'd found the source of the problem.  Well ... over the next couple of days, I turn them back on one at a time,  They have all been back on for almost a week now ... and the problem has not recurred.
Meanwhile, my other MacBook - which displayed the same problem, though less frequently - also no longer displays it.  (I don't run either of the third-party programs on the other MacBook, and I never changed the App Nap settings.  Oh, and it's my work machine and on a completely different network provider I have AT&T at home, it's Verizon at work - so in terms of network connections, the commonality is "The Internet".)
So this has vanished completely as mysteriously as it arrived.
                                                        -- Jerry

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