Java3D and VisAD with Red Hat 7.2

Hi:

When I run some of my applications on the RH 7.2 my x server crashes, but not on my Mandrake 8.0, Suse 8.0 or Windows.

I know that somebody asked it before, but ive been reading all the info and i still dont know how to solve the problem: what software ive to change; Xfree86 (now i have 4.1), Mesa ( 3.4),...? What its the best solution? And how to do it?

Thanks.