The Microsoft documentation states that ActiveDirectoryMembershipUser will throw a NotSupportedException when any attempt is made to access properties LastLoginDate and LastActivityDate.
See http://msdn2.microsoft.com/en-us/library/system.web.security.activedirectorymembershipuser.lastlogindate.aspx
and http://msdn2.microsoft.com/en-us/library/system.web.security.activedirectorymembershipuser.lastactivitydate.aspx
In consequence attempting to do EditUser in admin mode on an account returned by the ActiveDirectoryMembershipProvider causes:-
The property 'LastLoginDate' is not supported by the Active Directory membership provider.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NotSupportedException: The property 'LastLoginDate' is not supported by the Active Directory membership provider.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[NotSupportedException: The property 'LastLoginDate' is not supported by the Active Directory membership provider.]
System.Web.Security.ActiveDirectoryMembershipUser.get_LastLoginDate() +107
EPiServer.UI.Edit.UserMembership.PopulateMembershipFields() +341
EPiServer.UI.Edit.UserMembership.OnLoad(EventArgs e) +881
System.Web.UI.Control.LoadRecursive() +47
System.Web.UI.Control.LoadRecursive() +131
System.Web.UI.Control.LoadRecursive() +131
System.Web.UI.Control.LoadRecursive() +131
System.Web.UI.Control.LoadRecursive() +131
System.Web.UI.Control.LoadRecursive() +131
System.Web.UI.Control.LoadRecursive() +131
System.Web.UI.Control.LoadRecursive() +131
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1061