I'm using SharePoint 2010 (14.0.4763.1000) and have a user that is not showing on the People page (_layouts/people.aspx?MembershipGroupId=3). MembershipGroupId=3 is the Owner's Group.
When using PowerShell:
$group = $web.SiteGroups["XXXX Owner's Group"] $group.Users // Result : User listing and the user i'm looking for is listed
When doing $web.EnsureUser("_userlogin"), everything is working fine, but no change at all.
I can delete the User via PowerShell and add it back via the interface but it just won't show on the page.