Same crashing here with 10.5.3 on a MacPro. Fortunately, I keep my Blue & White G3 next to the MacPro. I share monitor and keyboard with a switch. So I was able to install Nikon Scan 4 onto the G3 from the CD I got with my Nikon Scanner (Coolscan V). OS 9 seemed to read the CD fine and even updated Nikon Scan. I also have an old Photoshop 7 on that computer. Sure it's a little slow, but it runs and I can copy the files over to the MacPro. I hope this helps.