Private Message Notification Pop-up Problem ?
 

Um in the past few days whenever I received PM's from people & then they reply back to me & vice versa , the Private Message Notification Pop-up didn't showed up even though in the option box , I did clicked on it & said that I want it to be shown .

Am I the only 1 who's having this minor problem ? as a result I've been replying PMs back to people later than usual