I am having some trouble with Pentax RAW files in iPhoto on my mac. As far as I can tell, this is a problem whether I shoot in PEF or DNG. I have a Pentax K200D camera. Many of my photos end up being solid black in iPhoto. I used to have a trial version of Aperture 2, and some of the photos showed up as solid blue in that program (the same photos showed up as black in iPhoto). This is a problem that seems to be getting more frequent. The pictures show up fine when I preview them in the finder. But once they are in iPhoto, a number of them show come up as solid black. Any ideas about what may be wrong? It seems strange that the frequency of this problem seems to be increasing. It also seems weird that the pictures preview okay in the Finder but give me trouble in iPhoto. I also just opened one in the Pentax Photo Laboratory program and was able to make adjustments okay. This issue is driving me crazy. Any ideas? I would be suspect of my SDHC cards, except that I am able to see the pictures okay in Finder and in Pentax Photo Laboratory.