Hi

I had an existing 4.5.2 site that already uses membership and I wanted to use nForum so I upgraded it to 4.7.1.

The site seems to be working find and nForum seemed to install ok.
I have added a forum node on the root of the site but there is something wrong. The forum home page shows but If I click in "Topic you participated in" or "Edit Profile" or if I add a forum category in the back end and try to click on it I get this error:

String was not recognized as a valid DateTime.

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.FormatException: String was not recognized as a valid DateTime.

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: 


[FormatException: String was not recognized as a valid DateTime.]
   System.DateTimeParse.Parse(String s, DateTimeFormatInfo dtfi, DateTimeStyles styles) +10264970
   System.Convert.ToDateTime(String value) +83
   nForum.BusinessLogic.Models.ForumMember..ctor(Nullable`1 memberId) +879
   nForum.BusinessLogic.MembershipHelper.ReturnMember(Nullable`1 memberid) +97
   nForum.BusinessLogic.BaseForumUsercontrol.get_CurrentMember() +36
   nForum.usercontrols.nForum.ForumParticipatedTopics.ShowActiveTopics() +43
   nForum.usercontrols.nForum.ForumParticipatedTopics.Page_Load(Object sender, EventArgs e) +36
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +18
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.Web.UI.Control.OnLoad(EventArgs e) +91
   System.Web.UI.Control.LoadRecursive() +54
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3488