The color shift ALWAYS happens on import to Aperture. That's because the first thing you see on import is the in-camera JPEG. After a few seconds, Aperture generates its own preview based on the RAW data, which is *guaranteed* to be slightly different than the in-camera JPEG because Aperture doesn't have access to the camera vendors "conversion recipe."
So you will always see a shift, no matter what.
So the question then is why is Aperture's rendering pink? There are a few possibilities:
1) You may have a preset that's applied at import that's doing this shift (double check your import settings)
2) You have some sort of color profile applied or are soft proofing - double check you aren't doing that
3) It could be an issue with Apple's conversion. If you can't fix it by white balancing then you may wish to use Aperture's "send feedback" mechanism and send a couple troublesome images to Apple. They may or may not respond but at least they'll be aware of the issue you're seeing.
Well the strange thing about that, is when importing into Adobe's Lightroom, I never have this issue. This can't be fixed with white balance, the pink hue is always there. I never selected a new color profile, so shouldn't the default be without the pink hue? Does anybody else shooting with Canon have this issue when importing RAW? How would I check if a different color profile has been selected by default?