I am using the Theme1_Standard_TOC_Only layout. And I finally found TOCNodeUp.png - after launching help, you click the TOC icon and resize the help window until you see only the TOC. Click a TOC entry that takes you somewhere else in the TOC (not to actual help content). The graphic shows up with the word "Back" as the top row in your TOC to take you back up one level in the TOC. Long story, but the file had gone "missing" and this was generating an error. I replaced the file, but the tester wanted to know what to look for to confirm that all was well again. And I had no idea where the graphic was being used, so I didn't know what to tell him. But the mystery has been solved! Lynn M.