I have been editing raw in Aperture 2 since its release. Using a G5 Mac Pro, dual 2.0GHz processors with 4Gb ram, ATI Radeon X800 XT video card, Max OS 10.5.6. This also occurs on my secondary laptop, a blackbook 2.3GHz C2D... Have always had a problem with an 'unrecognized file' message on a red screen, usually after processing many images in the same project. The application then refuses to recognize any of the images, even already worked on. I've put up with it, as restarting Aperture fixes the issue and we go on editing as usual. I figured that an update would fix it eventually, but has not. Getting to be annoying! I use Panasonic raw and Olympus orf files which are on the list of supported cameras... L1 and E-3 what's up? Sometimes in full screen mode (two 20" ACD's) the secondary screen goes black also, only in Aperture. I sure could use some help or suggestions please!