User not being added to all sites but only 1

I am using WordPress Multisite 3.2.1 on 12 servers. I successfully installed and used this plugin on one server, but it doesn't seem to be working on another. I'm not sure what details to offer other than there are no differences between the servers, but there is a difference of themes (I installed & used successfully in the Agentpress theme, but in the Enterprise Town Site Child Theme 1.0 by StudioPress theme, it only adds the user to the 1 site, instead of the 30 sites I need to add to. Any trouble shooting ideas would be appreciated. --Terri