I’ve already expressed my frustration at crash-prone Aperture 3.0. Since I want to be able to fully test the program I am still working with it, although with a small sample library – not with my actual serious photography.
I’ve found a way to stabilize Aperture 3.0 – at least on my system. By deleting my Aperture Preferences I started to see considerably fewer crashes. The Aperture plist is found in your User > Library > Preferences > com.apple.Aperture.plist.
If you want to give this a try, open Aperture and make a note of your preferences. They will all be reset once you do this, so be sure you can remember or recreate the current prefs.
Quit Aperture, delete the old plist and restart Aperture. This will clear out your old preferences and hopefully and performance bugs in Aperture 3.0.
In my tests, which have not been extensive, the program is significantly less crash-prone after I trashed the plist. The program is still a bit jiggy here and there, but at least the regular crashes seemed to have been dramatically reduced. I’ve only had one crash since I trashed the plist.
NOTE: Take this action at your own risk. While I can’t imagine it causing anyone any problems, I’m not responsible if it does. For me, it’s been pretty smooth sailing since.