Segfault using xvfb with Gazebo but not with xnest [closed]

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Hello everyone, I'm trying to get a little further with running Gazebo remotely.

On the remote machine, one display (:1) is provided by Xvfb, while the other (:2) is provided by Xnest.

glxinfo says both displays provide direct rendering. Xnest works, but Xvfb segfaults

Any suggestions as to what's happening?

The remote machine does not have a supported graphics card (yet Xnest works).

The local machine is a mac (running Snow Lepoard) with an nvidia card.

I hope Xvfb is going to be an option because it permits glxgears to operate at 487 FPS vs 4 FPS with Xnest.

I'm starting with gazebo on electric because this error message is more meaningful than what I see on fuerte (gazebo 1.0.1).

Program received signal SIGSEGV, Segmentation fault.
0x00007fffe40f5ad5 in Ogre::GLXWindow::create (this=0x7ffff7eb8288, name=..., width=542, height=305, 
    fullScreen=<value optimized out>, miscParams=<value optimized out>)
    at /tmp/buildd/ros-electric-visualization-common-1.6.3/debian/ros-electric-visualization-common/opt/ros/electric/stacks/visualization_common/ogre/build/ogre_src_v1-7-3/RenderSystems/GL/src/GLX/OgreGLXWindow.cpp:326
326 /tmp/buildd/ros-electric-visualization-common-1.6.3/debian/ros-electric-visualization-common/opt/ros/electric/stacks/visualization_common/ogre/build/ogre_src_v1-7-3/RenderSystems/GL/src/GLX/OgreGLXWindow.cpp: No such file or directory.
    in /tmp/buildd/ros-electric-visualization-common-1.6.3/debian/ros-electric-visualization-common/opt/ros/electric/stacks/visualization_common/ogre/build/ogre_src_v1-7-3/RenderSystems/GL/src/GLX/OgreGLXWindow.cpp
(gdb) bt
#0  0x00007fffe40f5ad5 in Ogre::GLXWindow::create (this=0x7ffff7eb8288, name=..., width=542, height=305, 
    fullScreen=<value optimized out>, miscParams=<value optimized out>)
    at /tmp/buildd/ros-electric-visualization-common-1.6.3/debian/ros-electric-visualization-common/opt/ros/electric/stacks/visualization_common/ogre/build/ogre_src_v1-7-3/RenderSystems/GL/src/GLX/OgreGLXWindow.cpp:326
#1  0x00007fffe40e84b2 in Ogre::GLXGLSupport::newWindow (this=0x737f60, name=..., width=542, height=305, 
    fullScreen=false, miscParams=0x7fffffffd3f0)
    at /tmp/buildd/ros-electric-visualization-common-1.6.3/debian/ros-electric-visualization-common/opt/ros/electric/stacks/visualization_common/ogre/build/ogre_src_v1-7-3/RenderSystems/GL/src/GLX/OgreGLXGLSupport.cpp:379
#2  0x00007fffe40a6a6a in Ogre::GLRenderSystem::_createRenderWindow (this=0x7ffff7eb7758, name=..., 
    width=542, height=305, fullScreen=false, miscParams=0x7fffffffd3f0)
    at /tmp/buildd/ros-electric-visualization-common-1.6.3/debian/ros-electric-visualization-common/opt/ros/electric/stacks/visualization_common/ogre/build/ogre_src_v1-7-3/RenderSystems/GL/src/OgreGLRenderSystem.cpp:1009
#3  0x00007ffff6e1146f in Ogre::Root::createRenderWindow (this=0x7ffff7ea78d8, 
    name=<value optimized out>, width=<value optimized out>, height=<value optimized out>, 
    fullScreen=<value optimized out>, miscParams=<value optimized out>)
    at /tmp/buildd/ros-electric-visualization-common-1.6.3/debian/ros-electric-visualization-common/opt/ros/electric/stacks/visualization_common/ogre/build/ogre_src_v1-7-3/OgreMain/src/OgreRoot.cpp:1199
#4  0x00007ffff5641be7 in gazebo::OgreCreator::CreateWindow(_XDisplay*, int, int, unsigned int, unsigned int) () from /opt/ros/electric/stacks/simulator_gazebo/gazebo/gazebo/lib/libgazebo_rendering.so
#5  0x00007ffff5642b8d in gazebo::OgreCreator::CreateWindow(Fl_Window*, unsigned int, unsigned int) ()
   from /opt/ros/electric/stacks/simulator_gazebo/gazebo/gazebo/lib/libgazebo_rendering.so
#6  0x00007ffff567b857 in gazebo::UserCamera::UserCamera(gazebo::GLWindow*) ()
   from /opt/ros/electric/stacks/simulator_gazebo/gazebo/gazebo/lib/libgazebo_rendering.so
#7  0x00007ffff58cf43a in gazebo::GLWindow::CreateCameras(double) ()
   from /opt/ros/electric/stacks/simulator_gazebo/gazebo/gazebo/lib/libgazebo_gui.so.0.10.0
#8  0x00007ffff58ddeac in gazebo::GLFrameManager::CreateCameras() ()
   from /opt/ros/electric/stacks/simulator_gazebo/gazebo/gazebo/lib/libgazebo_gui.so ...