window display hang..

Hi,

I’m doing my program using ARToolkit.
I create the animation program in ARToolkit and display the data of animation in window display.
After i used glutIdleFunc(environmentRedraw), my data in window display is change, however after that the window and video display is hang…
How to solve this problem so that the display is not hang and can continue my animation?
Anybody can help me…

thanks…