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Irrespective of user account, user privilleges on IE6 and unusual error consistantly occurs for several content editors when they attempt to log in.

Any ideas or pointers on the error below?

At /umbraco/umbraco.aspx (Referred by: /umbraco/login.aspx?redir=/umbraco/umbraco.aspx):

 System.ArgumentOutOfRangeException: Value to add was out of range. 

 Parameter name: value     at

 System.DateTime.Add(Double value, Int32 scale)    

 at umbraco.cms.presentation._umbraco.Page_Load(Object sender, EventArgs e)    

 at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)    

 at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)    

 at System.Web.UI.Control.OnLoad(EventArgs e)    

 at umbraco.BasePages.BasePage.OnLoad(EventArgs e)    

 at System.Web.UI.Control.LoadRecursive()    

 at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)