And I can add this from the event log: Type: System.InvalidCastException Message: Specified cast is not valid. StackTrace: at Microsoft.Dynamics.Nav.Client.WinClient.ExceptionHandler.<>c__DisplayClass6. b__4() at Microsoft.Dynamics.Nav.Client.WinClient.NavClientErrorHandler.ExecuteAndCatchExceptions(Func`1 execute) at Microsoft.Dynamics.Nav.Client.WinClient.ExceptionHandler.DoExecute(Func`1 execute) at Microsoft.Dynamics.Nav.Client.WinClient.ExceptionHandler.DoRethrowWithCatchException(Exception exception, Boolean designMode) Source: Microsoft.Dynamics.Nav.Client.WinClient HResult: -2147467262 ---------------------------------- Type: System.InvalidCastException Message: Specified cast is not valid. StackTrace: at Microsoft.Dynamics.Nav.Client.Formatters.NavBaseDateTimeFormatter.ValueToStringInternal(Object value, LogicalControl control, IFormatProvider formatProvider, Boolean displayFormat) at Microsoft.Dynamics.Nav.Client.Formatters.NavBaseDateTimeFormatter.ValueToString(Object value, LogicalControl control, IFormatProvider formatProvider) at Microsoft.Dynamics.Nav.Client.UIPatterns.CaptionManager.GetFieldStringFromValue(NavBindingManager bindingManager, String stringFieldId, Object fieldObject, IFormatProvider formatProvider) at Microsoft.Dynamics.Nav.Client.UIPatterns.CaptionManager.BuildListDynamicCaption(NavBindingManager bindingManager, IFormatProvider formatProvider) at Microsoft.Dynamics.Nav.Client.UIPatterns.CaptionManager.BuildDynamicCaption(LogicalForm form, NavBindingManager bindingManager, IFormatProvider formatProvider) at Microsoft.Dynamics.Nav.Client.UIPatterns.CaptionManager.UpdatePageCaption(LogicalForm form) at System.EventHandler.Invoke(Object sender, EventArgs e) at Microsoft.Dynamics.Framework.UI.BindingManager.ChangeStateToFilled() at Microsoft.Dynamics.Framework.UI.BindingManager.DoFill(DataReaderFillOptions fillOptions) at Microsoft.Dynamics.Framework.UI.BindingManager.Fill(BindingManagerFillOptions options) at Microsoft.Dynamics.Framework.UI.LogicalForm.LoadDataInternal() at Microsoft.Dynamics.Framework.UI.LogicalForm.LoadData() at Microsoft.Dynamics.Framework.UI.Windows.LogicalFormAdapterBase.OnLoadData() at Microsoft.Dynamics.Framework.UI.Windows.LogicalFormAdapterBase.LoadDataInternal() at Microsoft.Dynamics.Framework.UI.Windows.LogicalFormAdapterBase.Load(LogicalControl originatingLogicalControl, Boolean loadDataDelayed) at Microsoft.Dynamics.Framework.UI.Windows.ClientSessionBase.OnFormToShow(LogicalForm logicalFormToShow, LogicalControl originatingLogicalControl) at Microsoft.Dynamics.Framework.UI.WinForms.ClientSession.OnFormToShow(LogicalForm logicalFormToShow, LogicalControl originatingLogicalControl) at Microsoft.Dynamics.Framework.UI.UISession.OnFormToShow(FormSessionEventArgs e) at Microsoft.Dynamics.Nav.Client.PageRunCallbackHandler.RunPage(FormRunRequest formRequest) at Microsoft.Dynamics.Nav.Client.ServiceConnection.ProcessServerResponse(Object response) at Microsoft.Dynamics.Nav.Client.ServiceConnection.CallServer[T](BeginCallServerMethod beginCallServerMethod, EndCallServerMethod`1 endCallServerMethod) at Microsoft.Dynamics.Nav.Client.ServiceConnectionBase.DrilldownField(NavRecordState& state, NavDataSet recDataSet, Int32 controlId) at Microsoft.Dynamics.Nav.Client.DataBinder.NstDataAccess.DrillDownField(String personalizationId, String controlName) at Microsoft.Dynamics.Nav.Client.Actions.NavDrilldownAction.InvokeDataAction(LogicalControl logicalControl, UISession uiSession) at Microsoft.Dynamics.Nav.Client.Actions.PageDataAction.InvokeCore(LogicalControl logicalControl, Object state, UISession uiSession) at Microsoft.Dynamics.Framework.UI.LogicalAction.InvokeCoreWithErrorHandling(LogicalControl logicalControl, Object state, UISession uiSession) at Microsoft.Dynamics.Framework.UI.LogicalAction.DoInvoke(LogicalControl logicalControl, UISession uiSession) at Microsoft.Dynamics.Framework.UI.ActionControl.Invoke() at Microsoft.Dynamics.Framework.UI.Windows.ActionsHelper.ModalitySafe(Action action) at System.EventHandler.Invoke(Object sender, EventArgs e) at Microsoft.Dynamics.Framework.UI.WinForms.Controls.Stack.OnMouseUp(MouseEventArgs e) at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) Source: Microsoft.Dynamics.Nav.Client.UI HResult: -2147467262
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