My monitor's screen resolution has dropped from 1920x1200 to 1919x1200

I know this is an older post but I had (almost) exactly the same issue - a monitor that was being detected at completely the wrong resolution, this turned out to be a problem with the EDID from the monitor.

I resolved the issue with the help of my graphics card settings which allowed me to override the reported info and use my own custom settings.

I suspect a wrong setting.

1) First you can detect a missing row with a full screen test pattern:

http://www.lagom.nl/lcd-test/clock_phase.php

2) Then you can analyze your system and adjust display parameters with advanced apps:

• MultiRes: http://www.entechtaiwan.com/util/multires.shtm
• PowerStrip: http://www.entechtaiwan.com/util/ps.shtm

Warning: You can damage your video card and monitor with wrong settings.

The answer is 'yes'; it happened to you. I can assure you that this issue, or something of a similar nature, has happened to someone else, but they obviously don't frequent this forum or they've decided to remain silent about it. Nonetheless, as long as the question is left 'open' and no one responds in the affirmative, can you assume the answer is 'no'?

From a technical standpoint, which is the only interesting response, I would suspect a bad video card, and I'd suggest you try a different one, just to eliminate this possibility. I've seen much worse pixellation from seriously flawed cards and the erroneous resolution would almost have to be due to the card because the monitor could only suggest the 1920x1200 resolution since it doesn't have any special circuitry that recalculates it's resolution based on refresh rate or anything else. I would further guess that the card was damaged by overheating, if it's not a manufacturing flaw. Make sure the fan on the card is not obstructed by dust or not spinning at all. I'm assuming that you've already tried reinstalling the driver.