No X button to close forms

I just noticed that after the last update, none of the forms in Norton Security have the X button at the top right corner to close the form.  I can see the word "Close" displayed as a tip when I mouse over the area where the button should be, and when I click there, the form does close.  The same is true for the minimize button, which is just left of the where the close button should be. Is this by design, or is it a bug, or could it be caused by the way my display is configured? Thanks for any replies.