Ok, I must be missing something really easy. First, I setup the Web Access Redirect awhile ago and it's been working great. All I need to do now is change the custom logo that I already have in place. It must have been too long since I did this because I can't seem to get it to work.
I simply open the "webredir.nsf" database that I created previously. I attached the new jpg that I want to use for the custom logo and click Save and Close. HTTP has been restarted and now the entire Domino server has been restarted, but the old logo remains. What am I missing? :)