Just got a reply from Apple.
" 1. was the iPad supervised at the time of upgrading to iOS7?
2. in the new setup tab in the prepare section, is there anything checked?
If the answer to 1 is yes, please unsupervise a devise, prepare it and re-supervise it. Please do not use an existing backup to restore the iPad.
If answer to 2 is yes, follow suggestion 1, but uncheck all options in the setup tab before preparing."