Originally posted by bjdavey Apple fixed that problem soon after it became evident - Aperture now handles PEF files with no problem.
Yes, RAW Compatibility Update 3.1 introduced support for PEF, but all versions after that make my K-x RAWs have a hue shift to magenta. This bug is there for a year already, we are at RAW Compatibility 3.6 and Apple still haven't fixed this regression.
The only version that gets the white balance right and I keep installed manually is the 3.0, which didn't supported PEF at the time so I have to use DNG.