ICO replacement
 

Is the vbulletin favicon.ico file in a different place that the root? I have uploaded my favicon.ico to the root but nothing changes.

in the bottom of that page: http://tools.dynamicdrive.com/favicon/ you see how it works.

also, remember that your browser need to be cleaned out (cache) if you want to see the change!

and you'll need a link pointing to your favicon.ico if you are using a custom theme

Put:
at the top of your header template