This has happened twice now.
1. I deleted a .cfm file that was included in a page.
2. When I refreshed the page, I got the expected error message: File not found.
3. I restored the included .cfm file.
4. The page still couldn't find it.
5. Nothing I could do could ressucitate the broken page. It never could find the newly restored file.
I finally just had to make a copy of the included .cfm file and change the page to point to the copy.