Yes, FLS Vsync changed from what you a remember. It is set to functioning now. I'm not in front of my game computer at the moment but I believe from memory that is unchecked (you check to disable).
I would NEVER fly with one monitor so I'm not sure what the questions means? I'm not even sure if testing it would have any relevance since the computer basically treats it as a single, big wide monitor.
I would not know how to override VSync with the driver without looking but in looking at the card settings, I'm pretty sure that isn't it.
With the last update that I used (Friday?) this was still an issue and had not changed.
Thanks!