Originally Posted by a a i b 
My autofocus is fine, but this firmware update does break .PEF file support with Aperture 2.1.
Apparently the maker name in the EXIF header was changed from Pentax Corporation to just Pentax. This was done because Pentax was bought by Hoya.
Some RAW importers use the maker name for camera model identification. You can manually fix each file, use JPG or wait for a fix from Apple, Bibble etc