In Aperture, why do my RAW images momentarily preview well, degrade into extreme colour fringing

EOS 60D, EF 50mm f/1.4 USM.
Shot at f/1.4, ISO 3200, Auto white balance
I've loaded the images into Aperture 3.0, and they preview well while the images are loading (I'm assuming they're JPEG previews) then heavily degrade in quality after the image has fully loaded.
Is this a camera, lens, or Aperture issue?

I have no experience with what you are seeing but I can offer, my Mac buddies complain about poor performance with some of the Mac OS's and certain post processing software. I would start troubleshooting there.
EOS 1Ds Mk III, EOS 1D Mk IV EF 50mm f1.2 L, EF 24-70mm f2.8 L,
EF 70-200mm f2.8 L IS II, Sigma 120-300mm f2.8 EX APO
Photoshop CS6, ACR 8.7, Lightroom 5.7

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