I had a 15" PowerBook G4 running Tiger iLife '05 and iPhoto worked just fine.
Recently bought a 12" PowerBook G4 running Tiger and iLife '05, and every time any photo is edited (cropped, enhanced, red eye etc), the saturation of the photo will increase as the photo is saved. For instance I will remove red-eye, and the photo will be the same saturation. However when I click 'Done' or 'Next', the photo increases its saturation dramatically before saving changes.
Latest version of everything. Very frustrating!