I've been running Aperture 1.5 on my MacBookPro for months without issue, and now it crashes within 30 seconds of launching. In looking at the crash report I see a Kern Protection Failure. What might be wrong?
I should have added that Aperture will stay running until I click on an image to view or edit. Then, it doesn't matter what image I'm looking at in my library, it crashes as part of processing the file.
Sounds like a problem with the decoder. I would try an Archive and Install of the OS. If you find one of these images in the Finder (you can navigate into the Aperture library using ctrl-click to Show Package Contents) you should be able to open it in Preview. If Preview also crashes for sure you need to reinstall
Stick the OS or Restore DVD in and choose Archive and Install option. This will leave your user data untouched and most apps should continue to work fine although any apps that install portions into the OS folders will need to be reinstalled (Adobe apps and Apple Pro apps like Aperture for example).