Horizontal flickering screen lines in game (GTX670)

Not sure whats going on here… but in game I have these faint screen lines that run horizontally across the screen that flicker up and down… I’m running a GTX670 with latest drivers installed, no problems with any other games… I notice if i go into video settings and turn on v-sync the problem goes away, but then i get terrible cursor lag which is unplayable… the problem remains when I minimize the game, like I have now to post this and is even more noticeable on a white background window… Does anyone else have this problem with gtx670?