If you have a PowerMac and cannot get ScrapIt Pro started, please try the following:
Sounds like a problem with QuickDraw 3D. It seems that when Apple updated QuickDraw 3D, they left some older files in place when they shouldn't have or didn't update all files needed. The way to solve this is to remove any files associated with QD3D which are in the extensions folder and restart, see if that fixes it. If so, use Apple's installer to re-install QD3D and you should now be able to launch ScrapIt Pro.
For QuickDraw 3D, you must have the following files in your Extensions Folder (in the System Folder) for ScrapIt Pro to be able to view QuickDraw 3D items: