Raw file rendering problems with Canon EOS 5D in Aperture 3

Question

Since upgrading to Aperture 3, I have had serious problems with the rendering of Canon EOS 5D (not Mark II/III) RAW files. With Aperture 2, both the preview and full-sized images looked basically the same as the original images as displayed on the camera's display, without any adjustments.
With Aperture 3, each preview images initially look fine after import, but when Aperture re-renders it from the RAW file (e.g. when displaying the full-size image), the colors are drastically intensified, and the hue is shifted generally towards green/blue. I've checked the RAW Fine Tuning, and it is set to the defaults. If I turn the default RAW Fine Tuning settings all the way down, the image is still not at all like the preview from the camera - it becomes much darker and stays too blue/green, with washed-out colors.
A friend with a Canon EOS 5D MkII also recently upgraded her Mac from Aperture 2 to 3, and hasn't experienced any problems. We've tried importing RAW files from my (non-MkII) camera to her Mac (with the default RAW Fine Tuning settings), and get the same results as with my own Mac (i.e. strange colors), so the problem seems to be related to the camera model.
I've also noticed that scanned greyscale tiff images (including images that were originally imported under Aperture 2) are changed when first displayed by Aperture 3 - they become darker and more contrasty, with lots of information lost in the shadow areas.
I've also tried removing Aperture preferences, Aperture itself, and re-installing from download, with no change in the problem. (Aperture is the current latest version, 3.3.2.)
Has anyone experienced similar problems?

Answer 1

I'm having the same problem.
iMac running Mac OS X Lion 10.7.4 and Aperture 3.3.2.  Workflow is importing through Canon's DPP and then using referenced images in Aperture.  The images look great in LR4, or Canon's DPP but are flat and dingy in Aperture.
There's a free preset that goes part way to fixing it at http://theapertureblog.com/2011/02/10/my-aperture-workflow-for-working-with-cano n-5d-mark-ii-files/
but as good as this fix is, it doesn't quite do the trick. [not being a hater, and not saying I can do better]
I just got back from shoooting 1,500 images with a 5DMii and a T2i using Canon 24-105L IS, 70-200 2.8L, 50 1.8 and a Sigma 120-400 and the T2i images are not just better, they're in a different league.
I've tried shooting in Faithful, Neutral and also toggling these presets in different ways and still can't get Aperture to match what I see on the camera's screen or in other Apps.  I love the interface and DB of Aperture, but what's the point of using it if it doesn't produce and awesome image in the end?