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Subscribe to the Modules.UserManagement.Notifications.UserSaved notification and login the user again:

<Subscribe(Dynamicweb.Modules.UserManagement.Notifications.UserSaved)> _
Public Class NotificationSubscriber1
 Inherits NotificationSubscriber

 'For notifications passing an object inheriting Dynamicweb.Extensibility.NotificationArgs
 Public Overrides Sub OnNotify(ByVal notification As String, ByVal args As Dynamicweb.Extensibility.NotificationArgs)
  'Make sure we are in the frontend...
  If Not PageView.Current Is Nothing Then
   Dim myArgs As Dynamicweb.Modules.UserManagement.UserNotificationArgs = DirectCast(args, Dynamicweb.Modules.UserManagement.UserNotificationArgs)
   Dim ex As New Security
   ex.ExtranetLogin(myArgs.Subject.UserName, myArgs.Subject.Password)
  End If
 End Sub
End Class

using System;
using System.Web;
using Dynamicweb;
using Dynamicweb.Extensibility;
using Dynamicweb.Frontend;

namespace CustomModules.CustomModules
{
    [Subscribe(Dynamicweb.Modules.UserManagement.Notifications.UserSaved)]
    public class UserManagementBugFix : NotificationSubscriber
    {
        public override void OnNotify(string notification, NotificationArgs args)
        {
            if (PageView.Current() == null) return;

            var una = args as Dynamicweb.Modules.UserManagement.UserNotificationArgs;
            if (una == null) return;

            // We only need to fix the bugs once, so lets check if we have already fixed it
            // - User managent calls User.Save multiple times on create/edit profile
            if (HttpContext.Current.Items.Contains("UserManagementBugFix")) return;

            // Edit profile: Update session after edit
            // - How the hell did you miss that one DW? :)
            if (Base.ChkString(Base.Request("Action")).Equals("Edit"))
                new Security().ExtranetLogin(una.Subject.UserName, una.Subject.Password);

            // Create profile: Update ValidFrom to ensure that the autologin feature works
            // - Problem with Dates.DWNow precision when used in Security.ExtranetLogin - user not active yet!?
            if (una.Subject.ValidFrom.AddMinutes(1) > DateTime.Now)
                una.Subject.ValidFrom = DateTime.Now.AddMinutes(-1);

            HttpContext.Current.Items.Add("UserManagementBugFix", true);
        }
    }
}