I have legacy ad blocker specifications in my userContent.css, I think the problem is that the home page graphics are kept in a directory called "banners" and this is one one of the path name elements blocked by the ad blocker.
Errmm, doesn’t work with firefox 1.5.0.4 on my mac, the home page graphics do not appear. Works fine with opera and safari. Maybe my configuration is odd but I doubt it.
The random header is all driven off of a checkbox TV with an @DIRECTORY binding (coming in 0.9.2) and is displayed through a snippet I wrote that takes one random item from a list style TV.
I also wrote a small Snippet that will only display a TV’s widget if there is content in the TV so that you don’t get empty tags for TVs that aren’t really being used.