Thanks, Conrad.
I suspect you're right about the graphics card. I'll mention it to the IT person the next time I see him in case he has a reasonably easy solution. However since I'm only there as a temporary fill-in for the next two months, I'll probably just live with it for that time. Not a big deal, as most stuff I would access from home is on the main monitor anyway. The one program I leave on the second monitor screen I can move over to the main screen before I leave work if I expect to access it later.
Rod