ON DEMAND menu sizing issue

The picture on my TV fits the TV perfectly, except when I'm in the ON DEMAND menu.  Then, the picture expands beyond the boundaries of my TV and cuts off the text along the edges, making it difficult to scroll through the selections.  Once a selection is made (such as a movie), the program is in the normal size and fits the screen.  The only problem I have is in this regard is the ON DEMAND menu.