bbFlip question

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DrMark

After buying a new dev machine I have noticed that (in windowed mode) bbFlip( 1 ) no longer waits for the vertical blank. This is messing up my game. I tried timing multiple calls to bbVWait also and it is clear the calls are not working as I thought they should ( bbVWait( 100 ) took 1ms ). The video card has the latest drivers and is a Ge Force 8800 GT.

Is this something to do with windowed mode that I dont know about or a bug maybe?