I am setting up a multisite that will have 4 sites. I want users to register for one site and get Contributor role for that site. Currently there is no role being assigned. I tried changing the setting in Edit Site>Settings, but it did not work, so I changed it back to subscriber. I installed User Role Editor, and change the default role to Contributor for one of the sites, but when I register a new user for that site, the role is still blank. What am I missing?