Has the latest version of Aperture ever run on your system or did the problem start as soon as you installed it?
Is it always the same image that causes this to happen?
Have you tried running a library repair? If not see Aperture 3: Troubleshooting Basics for instructions.
If you still have the crash
Copy the first 50 lines or so of the crash report here.
Ok good,. If it comes back follow the suggestions in my post so we can see what's in the crash log.
Message was edited by: Frank Caggiano - Are you saying that every time you start Aperture it asks for the library? What if (with Aperture closed) you locate the library in the finder double click it, what does Aperture do then?