I've recently upgraded from WPMu2.8.1 to WP3.2.1, and the only glitch I'm seeing (and it's most likely on my end) is that only a few blog admins cannot see everything they should.
Under Appearance, they see:
when they should see
I've verified that they have the correct user_level and capabilities in the wp_usermeta table.
I can't link the sites, but I can provide any info to help troubleshoot. Thanks folks!