Preview and FE Edit
In all of our instances it is not possible to use adminpanel and feedit, accept in the first domain.
So an editor can't see a hidden page, except he works in the first domain, admins, too!
So feedit works also only in the first domain, this must be the same reason, and it's no matter, if we use an own template for each domain, switching adminpanel = 1 etc.
In the illustration the upper part is the first Domain, every thing works fine.
The second one is a subdomain, with its own site-menagement, using the same setup and extensions from the first.
Using an own setup has no effects!