[vtkusers] Core dump in Cone.tcl

[Chandragupta Ganguly]

HI
I am running vtk and am getting a core dump for the command
vtk /opt/vtk/graphics/examplesTcl/Cone.tcl 

the trace stack is
#0  0x40ebe6d0 in glXGetCurrentContext () from /usr/lib/libGL.so.1
(gdb) where
#0  0x40ebe6d0 in glXGetCurrentContext () from /usr/lib/libGL.so.1
#1  0x40ebe6a8 in glXGetCurrentContext () from /usr/lib/libGL.so.1
#2  0x40966f20 in vtkOpenGLRenderWindow::WindowInitialize ()
   from /usr/lib/libVTKGraphics.so
#3  0x409682fc in vtkOpenGLRenderWindow::Initialize ()
   from /usr/lib/libVTKGraphics.so
#4  0x40965f9b in vtkOpenGLRenderWindow::Start ()
   from /usr/lib/libVTKGraphics.so
#5  0x405b8034 in vtkXRenderWindowTclInteractor::Initialize ()
   from /usr/lib/libVTKGraphicsTcl.so
#6  0x4061c4e5 in vtkRenderWindowInteractorCppCommand ()
   from /usr/lib/libVTKGraphicsTcl.so
#7  0x4061c281 in vtkRenderWindowInteractorCommand ()
   from /usr/lib/libVTKGraphicsTcl.so
#8  0x410bb869 in TclInvokeStringCommand () from /usr/lib/libtcl8.3.so
#9  0x410f62e1 in EvalObjv () from /usr/lib/libtcl8.3.so
#10 0x410f69eb in Tcl_EvalEx () from /usr/lib/libtcl8.3.so
#11 0x410ed65a in Tcl_EvalFile () from /usr/lib/libtcl8.3.so
#12 0x41014a65 in Tk_MainEx () from /usr/lib/libtk8.3.so
#13 0x8048b77 in main ()
#14 0x41307b65 in __libc_start_main (main=0x8048b3c <main>, argc=2,

any ideas as to what the problem is
thanks
chandra