I've seen several reports of problems at 144Hz with a CF setup. Since you didn't provide any details about your hardware at all, I can only speculate that you fall into the same camp.
This would seem to be a driver bug that you should report (see the link on the beta driver download page). Beyond that, use 120Hz until it's fixed. It's doubtful in the extreme that you'd be able to tell the difference between the two.