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Donna, About the error starting the IDV Xlib: extension "GLX" missing on display ":0.0" Two possibilties are you do not have the x support rpm for GLX installed, or you need a Linux driver for an Nvidia graphics card. If you are not using the Nvidia binary drivers with their GLX package then the two RPM's you need are XFree86-GLX-4.3.0-15 XFree86-GLX-devel-4.3.0-15 doing this : rpm -qa | grep -i glx do you see this? XFree86-GLX-4.3.0-15 XFree86-GLX-devel-4.3.0-15 supposedly the GLX drivers for XFree86 4.X. "This is required, if you want to use DRI for XFree86 4.x 3D support." DRI is the 3D graphics accelerator. But I don't see it on my system, all I see with rpm -qa | grep -i gl is qt1x-GL-1.45-16 Do you see even that? So I bet, like me, you have an Nvidia graphics card. Can you say, and if so what kind? Stu -- **************************************************************************** Unidata User Support UCAR Unidata Program 303 497 8643 P.O. Box 3000 address@hidden Boulder, CO 80307 ---------------------------------------------------------------------------- Unidata WWW Service http://my.unidata.ucar.edu/content/support ****************************************************************************