WPMU Footer HTML not working

Can I get help for the WPMU Footer HTML plugin (from wpmudev.org) here?

I use this plugin successfully to display ads in the header and footer of non-supporter blogs on one site currently running WPMU 2.7.1, by wrapping adsense scripts in the "supporter_hide_ads" code provided with the Supporter plugin.

I'm doing the exact same thing on our new site running 2.8.2 but it's not working. Please advise where I might seek support for this plugin if here is the wrong place. Thanks!