> This is a common GL problem, not related to FLTK.
>
> Your card or driver may handle the second monitor in a different way.
> Ensure that the visual modes for both monitors are the same, otherwise
> the driver might resort to software-only when dragging a window from one
> monitor to the other.
>

In my previous version, I use glut and MFC for GUI development.
The previous version goes well in both single monitor mode and dual monitor 
mode.

Thus I think the problem is related with FLTK .

My video card is Intel GMA 900 onboard, and my system is Win xp Sp2.
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