Richard,
Per your request, I'm posting the question I posed in my survey for Expert 3.  
In lesson 4 (at ~20:45), when you redirect the source for the new Product Categories button, there is an initial green corner, top left of the copied Products box. Then you save it, reopen it, and the green corner disappears. What changed between saving and opening that caused the green corner to disappear?
Best regards,
Kent Jamison