There a a number of different issues at play.
This is the embedded preview extracted using Exiftools. The preview is 3200 x 2400 which is 4 x 3. (I resized it here upload speed).
However, the embedded preview when seen in Aperture, is squashed into a 3 x 2 format image:
When the raw is loaded, this is what is seen.
As well as the purple issue, the file is cropped at the top and bottom and stretched back to 4 x 3 format. Very weird!
Aperture is mis-interpreting the files data, especially the blue channel which is all hunched into the image midtones.
If you add a curves adjustment and use auto (the coloured version) it will get the image a bit closer, I then tweaked the curves (and also used WB and Levels) to get the image closer:
However, obviously, the image is still cropped.
Here are the curves for each of the RGB channels. I added a second curve, to tweak the blue becuse it was hard to work with with the data all hunched up.
You don't need to be concerned about your raws. I checked them in RawTherapee and they seem fine and corruption-free.
I'm convinced this is an Aperture issue, where one of the settings is confusing Aperture (look for a common theme in the affected images, did you choose to shoot in 3 x 2, is it just the long exposure ones, etc).
When Apple releases a fix, your images should return to normal.
In the mean time, you can use Exiftool to extract the embedded previews to have 3200 x 2400 jpegs to play with, or use an alternative convert to create TIFFs for using in Aperture.
Andy
