[WLUG] Setting up new monitor

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? -- Rich