This is what I'm getting when I choose the Restriction from the dropdown control:

NullReferenceException
 Object reference not set to an instance of an object.
Source     : MicroFour StrataFrame Security
Stack Trace: 
   at MicroFour.StrataFrame.Security.UserEditor.SaveData(TreeNode Node, SetDataPiece SetPiece)
   at MicroFour.StrataFrame.Security.UserEditor.cboRestriction_SelectedValueChanged(Object sender, EventArgs e)
   at System.Windows.Forms.ListControl.OnSelectedValueChanged(EventArgs e)
   at System.Windows.Forms.ComboBox.OnSelectedValueChanged(EventArgs e)
   at System.Windows.Forms.ComboBox.OnSelectedIndexChanged(EventArgs e)
   at System.Windows.Forms.ComboBox.WmReflectCommand(Message& m)
   at System.Windows.Forms.ComboBox.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Anything I should look at?