Trying to add an AD group to access editor pages, but the users in that group can not log in. Gets windows login pop-up windows, but it never authenticates the user. If I add the user to the servers Administrators group then the access works.
Is there a problem if the AD group name contains white spaces? Can see the group and its users in EPiServer admin page, manage groups.
Are you sure that your user really gets the group membership that you are using in web.config. I would write a simple test page that list the membership in "view" mode to see if the user gets the exptected group membership.