According to both David Lawson and Peg DeBiasi, the new Color It 3.2.3 update crashed on launch, especially when loading certain plug-ins such as WildRiverSSK. Both users were running Mac OS 8.1 with HFS Plus. ColorIt 3.2.1 worked fine.
Update Rachel Robbins adds: "I had the same problem. However, I found that if I put the plug-ins at the root level of the plug-ins folder, that fixed the problem. In most cases, if I put plug-ins in folders inside the plug-ins folder, I immediately got a freeze or crash again."