Users logged out on front end (mapped domain) while logged in on admin (original domain)

Hi,

I have set the Domain Mapping options:
- Administration mapping: original domain
- Login mapping: original domain
- Cross-domain autologin: Yes

Now, when a logged out user goes to his site and tries to connect via http://mapped.dom/wp-admin/ he will get redirected to http://site.original.dom/wp-login.php?redirect_to=http%3A%2F%2Fmapped.dom%2Fwp-admin%2F which is as expected but the user cannot log in. He will get redirected to the same login! Is it because of that mapped domain in the redirect_to paramter?

Only when accessing via an initial request like http://site.original.dom/wp-admin/ (resulting in redirect_to with the original domain) it is be possible to actually log in.

But then, when visiting the front end again (to verify changes for example) the user appears to be logged out. No admin bar and no 'Edit' links...

I also noticed that when setting:
- Administration mapping: mapped domain
- Login mapping: original domain
it effectively becomes impossible to log in at all... It might be wise to not allow this combination of options.