| posts: 1,391 | Location: Chicago
I have had this issue as well. My game always ran at 59Hz in the setting, so I thought the game was just really demanding on a system and poorly coded. But then one day i started to play it, and it ran perfectly smooth for about 3 minutes until it went back to jitteryness. During those 3 minutes, i looked in the settings and it showed 60Hz for the first time instead of 59Hz. After that, i was determined to only play it at 60Hz, so i started messing with monitor drivers and forcing 60Hz through nvidia control panel, etc. None of that worked. In my research, i found that monitors getting stuck at 59Hz is a common issue with no solution, though it has not affected any games other than this that i have been able to tell. I have an Nvidia GPU and a stock clock i7 920. It was a serious tease to let me play it perfectly smooth for a whole 3 minutes. I have not tried turning Aero off though, I will give that a shot.
Let me know if you find a solution.