Hi,
I posted this in BUG reporting section also, but with 500 views I got no responses. Maybe this is a better section to ask people to at least confirm the behavior I am seeing on my boards.
Rather than flooding the forum with repeated text, I will link to the original thread and ask for response either here or in original thread.
http://arduino.cc/forum/index.php/topic,162134.0.html
Can someone please spend 5 min to run the test code and at least confirm that you get same results? i.e. Serial flag is not clearing when COM port is closed.