Production AuthManager issue

Hi.  We just went into production with our new CS02 sites last night.  We
are 
noticing this error.  We think it might have something to do with users
that 
have a cookie set from the previous version of the site (CS 2000).  Any
idea 
what is causing this and how we can fix it?

            Type : System.Runtime.InteropServices.COMException, mscorlib, 
Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
            Message : AuthManager(CommerceServer): Most probably the 
AuthTicket has been Encrypted using a different EncryptionKey. Just
refresh 
the same page again and Everything should go fine.
            Source : Commerce.AuthManager.1
            Help link : 
            ErrorCode : -2146893819
            TargetSite : System.Object 
GetUserID(Microsoft.CommerceServer.Interop.TicketTypeEnum)
            Stack Trace :    at 
Microsoft.CommerceServer.Interop.AuthManagerClass.GetUserID(TicketTypeEnum

enumTicketType)
               at
Microsoft.CommerceServer.Runtime.ProfileTicket.get_UserID()

I saw a post where someone else had the same issue, and we verified that
CS 
Authentication resource is under global resources.  We have not made any 
changes to the resource either. 

Thanks,
Jason