The Domain Mapping plugin turns out to be the ultimate nightmare!
If it’s activated the superadmin has no longer an admin bar menu on all sites.
I deactivated all plugins except domain mapping, tried out all themes even twenty twelve, but always the same problem.
So I deleted and reinstalled the plugin, but the admin bar menu is not showing up.
Without domain mapping plugin everything is fine…
You have access, so please have a look.
Thanks for your help