This should solve the problem in Aperture 1.1:
1. I'm assuming that you have Aperture 1.0 installed.
2. Upgrade Aperture to version 1.1 using Software Update.
3. Make a backup copy of Aperture.
4. Open Aperture.app/Contents/MacOS/Aperture in a hex editor.
5. Edit the following offsets: (format is offset: original –> hacked)
0×93b8: 40 9E 00 88 -> 48 00 00 88
0×9454: 40 9E 00 88 -> 48 00 00 88
0×94f0: 40 9E 00 E0 -> 48 00 00 E06. Save the file and run Aperture.
I first wrote up this method here; some of the comments to this article might be useful.
[kirkmc adds: I haven't tested this; I don't use Aperture, and don't have a 12" PowerBook.]

