CronosPlus live video window hanging

I wrote a simple server to display a live video window on the screen.
It uses the MIL ShowLiveWindow(..) call. It works correctly on one
computer. On another system, purported to be the same (XP-Pro, 2Ghz),
the video redisplay hangs. After 20-40 seconds the image stops
updating and the last image stays on the screen. MIL is not dead. The
video display will restart by resizing the window.

The MIL_CURRENT_VERSION define in the MIL header is 7.5. The
CronosPlus card is new.

Has anyone else had this problem?

Thanks.


Dave P.