As I'm creating a sequence diagram, i'll add a message to go from one object to another. In the notes field, I'll enter comments. When I close the dialog box, the sequence notes display on the right side of the diagram. If I open up the message dialog imediately , the notes will correctly display in the notes field of the dialog box.
But if I close the dialog, and select any other object, then go back the the message and open the dialog box, the notes are gone. i.e., they don't display in the dialog and when I close the dialog, the disappear from the diagram.
If I open the message dialog again, enter notes, and close the dialog, the new notes show up. I leave the message selected, press ctrl-s to save the diagram, then open the message back up, the sequence notes are again lost. (even though the message with the notes has never been deselected.)
Finally, I'm not 100% sure about this. But it appears that the problem described above is only true for function calls. If the messages is a "isReturn" message, the notes seem to be preserved ok.