I think something broke with the Appointment Recurrence Description and InitializeFrom.  You can duplicate the issue by running the sample WinSchedule.Appointment Dialog 2007.  Add a new appointment with a double-click so the dialog window appears.  Click on Recurrence, then click OK in the Appointment Recurrence window to add the recurrence pattern.  You get a runtime error when it tries to access the Description for the recurrence object.  In the method InitializeFrom where it copies the recurrence from the form back to the original recurrence object something is failing and the Description is not filled (or the underlying objects it depends on are not filled).

This worked in 11.2 for me.  Now in 12.2 it's broken.

Runtime Error message:

See the end of this message for details on invoking just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text ************** System.NullReferenceException: Object reference not set to an instance of an object.    at Infragistics.Win.UltraWinSchedule.AppointmentRecurrence.get_Description()    at AppointmentDialog2007_CS.AppointmentDialog2007.VerifyAppointmentStatus()    at AppointmentDialog2007_CS.AppointmentDialog2007.OnToolClick(Object sender, ToolClickEventArgs e)    at Infragistics.Win.UltraWinToolbars.UltraToolbarsManager.OnToolClick(ToolClickEventArgs e)    at Infragistics.Win.UltraWinToolbars.UltraToolbarsManager.FireEvent(ToolbarEventIds id, EventArgs e)    at Infragistics.Win.UltraWinToolbars.ButtonToolUIElement.DoClickProcessing(MouseEventArgs e)    at Infragistics.Win.UltraWinToolbars.ButtonToolUIElement.OnMouseUp(MouseEventArgs e)    at Infragistics.Win.ControlUIElementBase.ProcessMouseUpHelper(Object sender, MouseEventArgs e)    at Infragistics.Win.ControlUIElementBase.ProcessMouseUp(Object sender, MouseEventArgs e)    at Infragistics.Win.Utilities.ProcessEvent(Control control, ProcessEvent eventToProcess, EventArgs e)    at Infragistics.Win.UltraControlBase.OnMouseUp(MouseEventArgs e)    at Infragistics.Win.UltraWinToolbars.UltraToolbarsDockArea.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)

...

Thanks