Using Sony A700 with cRaw. Had the same Problem with pictures showing up magenta.
Clem's advice reinstalling RAW-support 2.1 helped me. Everything back to normal.
THANK YOU Clem.
RAW-version2.2 is exactly, where CLEM said:
Main-HD(or whatever your bootdrive is named)/System/Library/CoreServices/RawCamera.bundle
To delete your asked for admin.
The whole story you can find in Clem's reply dated 17.09.08
the workaround again here as a copy
Delete the file: System/Library/CoreServices/RawCamera.bundle then (re)install the previous version.
Get the previous version here:
http://www.apple.com/support/downloads/digitalcamerarawcompatibilityupdate21.htm l
It may be, that some preview-pictures stay corrupted. you have to rebuild them with the appropriate action from the pictures menu (may be not exactly, I'm using german version)