JAVA 3D on Linux 7.0

hello bill,
        I have installed Java 3D on linux 7.0
        Whenever I run examples on Linux7.0
        the x-server is getting crashed.
        Well even in VisAD examples
        ref:: P4_01.java of Tutorial in Section 4
        the Display.RGB is not getting mapped correctly.
        Can anyone help me out.
        
        Its fine with my older Linux6.2 Version
yours
PRAVEEN