Bug? WPMU admin_footer hook

Hi there,

I think I have discovered a bug with admin hooks in WPMU 2.7.1

I wrote a plugin, which I want to run at the bottom of every admin page

add_action("admin_footer", 'testMyFooterPlugin',);

function resetModeration()
{
     echo "<script language='javascript' >\n";
     echo "alert('footer plugin hook')";
}

The plugin has been activated site-wide.

I have found strange behaviour. When I am logged in as administrator, the plugin fires.

When I am logged in as a new user with a new blog, the plugin does not fire.

If I log in as administrator, add admin to the new blog, log out, then log back in as the new user — the plugin fires.

It’s very strange. Is this a bug? Is there a reliable action that I can use as a hook on admin pages? I have tried admin_head and found the same behavior.