Umbraco Version: 4.7.2
.Net Version: 4.0
Windows Version: 2008
IIS Version: 7.5

For some reason after I have changed a username from code like this:

public static MembershipUser member = Membership.GetUser();
umbraco.cms.businesslogic.member.Member membera = new umbraco.cms.businesslogic.member.Member((int)member.ProviderUserKey);
membera.LoginName = UserName.Text;
membera.Email = UserName.Text;

And then I clear the cache and logs out the user like this

umbraco.cms.businesslogic.member.Member.ClearMemberFromClient(membera.Id);
FormsAuthentication.SignOut();
HttpContext.Current.Session.Abandon();
umbraco.cms.businesslogic.cache.Cache.ClearAllCache();

But for some reason the old username/email appears, when I log back on with the new username on several pages with getting the data like this:

public static MembershipUser member = Membership.GetUser();
UserName.Text = member.Email;
Email.Text = member.Email;