Feb 16, 2012 08:39 AM|aspnet2sams|LINK
when I saw the page source of it, I found that a class hasn't applied to that element.
I too did the steps to view page source, my findings were of class applied of un-answered icon. though the thread is marked as answer.
So actually the root cause is identified thanks all of you.
Okay, let the developing team look into the matter to rectify.