vsync stopped working..

I was playing prcp.wad for around four hours with no trouble. I started playing the tnt iwad and noticed tearing in the screen. I checked the control panel and it was still on but yet it dose nothing. I tried other iwads and even pwads and still vsync is broken. I forced on vsync in my video card settings and still did not help! It just went somehow.. I have no ideas how!?

edit: I switched the texture filtering from quality to high performance and force mipmaps to trilinear. The problem disappeared. Don't know how it was related since it worked for a long period without the changes and to all of the sudden stop. This is weird :-/ .
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