bbFlip question

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?

It is setted Up on your Graphics Card +> Open the control Panel for your graphics Driver
In the 3D Display tab, You 'll find something like "VSync Control" with a check Button or something like "Controlled by Application"

You 'll maybe find an other setup for desktop applications.