Private message won't delete
 

When I logged on, I had a private message. After I read the message, I usually delete it. When it's deleted, the yellow box displaying the PM always re-sets to No Unread message.

Now, the yellow box is still showing that my just deleted message, is unread.

And to make matter worse, every time I open a forum on 'my Flyertalk', the pop-up window keeps opening. Very annoying.

Why is this happening?