i get the same "tearing" its an optical illusion coz i tried print screening a few times and always the screen was fine.
You can't take a screenshot of this effect because it's a mixture of two frames. :)Fiddling with the vsync setting in my driver I can get rid of the tearing but the bars movement becomes really jerky. :/
Besides, I thought using 'vwait:flip false' isn't supposed to be affected by any driver settings - that's what the manual says and that's the reason I want to use it. I have no idea what's going on. :|