Domain Mapping - Login Two Time, Users forced to log in and Settings not saving

Hi,

Ever since the last update out mutliple sites are acting very stangely. Swithcing between site admins asks for login again, but most often a 2nd time too. But also a good portion of our user based (over 30 people now) have serious issues logging in to our sites. The problem varies from mutliple login, having to clear cookies, changing password, and combinations of that. Then some of the same users have the problem again a week later.

We've troubleshooted this down to this plugin. We've disabled ALL plugins but one, this one, and we still experience the problem.
Of particular note, (see screenshot), whenever you try to change any of the settings, they do not survive.

Please help!