UBB.threads PHP Forum Software Community Forums Resources and Customizing How Do I? What determines what forum list category's are display on the Active Topics page?

Well the greasy spoon is a forum not a category.
It is placed in the The Front Office category.
It appears that you just have some permissions and settings a little off of what you want.
As a guest I can't see the greasy spoon , but as a user I can.
Also you don't have a island enabled for active topics but just the menu.