Thank you for your prompt response. The problem seems to have been with my office computer. The file you sent didn’t work on it, either. But when I tried it on my home computer, it worked fine; as did my attempts to use the Shadow Catcher with my own file. Now this morning after I restarted my office computer, the Shadow Catcher is working just fine. I should know by now that sometimes when things don’t work in Cinema, either copy/paste everything into a fresh, new scene, or if that doesn’t work, reboot the computer….