Domain Mapping no longer working

Hi,
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
Peter