It always defaults to off after restarting Crysis 3. Even when it says it's On, it's really off. So you have to disable and re-enable it. Please fix this.

Do you have r_vsync = 0 in a game.cfg or autoexec.cfg that's set to read-only? Vsync forced Off in Nvidia Control Panel? Vsync acts fine on my end.

That code wasn't in my game.cfg nor my autoexec.cfg

V-Sync in Nvidia Control Panel was set to "Use the 3D Application Setting"

I also have options to turn it On, Off. Or Adaptive and Adaptive Half-Refresh Rate.

I'm running a GTX 560TI and using it with a pretty old HDTV, 720 P so I think I'm needing V-Sync.

They are aware of the issue but they already had the patch in place before they knew about it.. apparently it will be fixed in a future patch...