I just updated to DNN 7 from 6.2.4 and at first glance all was well but when I went to "edit page" mode I get the following error. Any ideas as to the cause would be appreciate

Mark

[NullReferenceException: Object reference not set to an instance of an object.] DotNetNuke.Security.PortalSecurity.IsInRoles(String roles) +418 DotNetNuke.Security.Permissions.PermissionProvider.CanViewPage(TabInfo tab) +175 DotNetNuke.Security.Permissions.TabPermissionController.CanViewPage(TabInfo objTab) +34 DotNetNuke.Common.Globals.ValidateLoginTabID(Int32 tabId) +303 DotNetNuke.HttpModules.UrlRewriteModule.RewriteUrl(HttpApplication app, String& portalAlias) +4728 DotNetNuke.HttpModules.UrlRewriteModule.OnBeginRequest(Object s, EventArgs e) +939 System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +79 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +164