I picked up a free monitor today, a Samsung S24C230L.  The native resolution is 1920x1080, and it's connected via DVI.  The existing monitor has a native resolution of 1680x1050 and is plugged into the analog VGA port.  The NVIDIA X Server Settings seem to agree, so what's up with the display on the second monitor?
https://photos.app.goo.gl/M1R9MQnDMCaD7qca6
When I try saving the X Configuration File, it warns me that I should use relative positioning for the second display, instead of absolute positioning.  Maybe that's the problem, but I can't find that setting anywhere.

Got any ideas?

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Rich