picture on TV distorted after change to Uverse

My elderly inlaws recently got Uverse, bundled.  Most of the TV shows they now watch are slightly out of picture (too large), but not terribly; any show they record and then watch later is too large by about half, and is just unwatchable.  My husband (pretty talented with that stuff), and two separate neighbors have all tried to help, with no avail.  The difficulty only happened after the switch.   Any specific ideas?