Location : /home/michael/vbox/branches/VBox-4.3/src/VBox/Runtime/common/misc/thread.cpp(553) RTTHREADINT* rtThreadGet(RTTHREADINT*) Then if I try to run 4v this also libGL error: pci id for fd 10: 80ee:beef, driver (null) The first thing I get after installing your version of the guest additions is that apport reports that /usr/lib/libgnome-descktop-3-7/check_gl_texture_size crashes with signal 5 in rtThreadGet(). OpenGL Warning: glXGetFBConfigAttrib for 0000000003790850, failed to get XVisualInfo OpenGL Warning: XGetVisualInfo returned 0 visuals for 0000000003790850 The problem I am experiencing with the v4.3.20 VBoxAdditions shows up if I try to run P4V (a perforce client). I am running Ubuntu 14.04LTS 64-bit in the VM, hosted by Windows 7 64-bit. I have been experiencing a similar problem so tried installing the VBoxAdditions that you attached. OpenGL Warning: glXGetFBConfigAttrib for 0000000001acf250, failed to get XVisualInfo OpenGL Warning: Retry with 0x8002 returned 0 visuals OpenGL Warning: XGetVisualInfo returned 0 visuals for 0000000001acf250 LibGL error: failed to load driver: vboxvideo LibGL error: core dri or dri2 extension not found OpenGL Warning: glTestFenceNV not found in mesa table OpenGL Warning: glSetFenceNV not found in mesa table OpenGL Warning: glIsFenceNV not found in mesa table OpenGL Warning: glGetFenceivNV not found in mesa table OpenGL Warning: glGenFencesNV not found in mesa table OpenGL Warning: glFinishFenceNV not found in mesa table OpenGL Warning: glDeleteFencesNV not found in mesa table OpenGL Warning: glGetFinalCombinerInputParameterivNV not found in mesa table

OpenGL Warning: glGetFinalCombinerInputParameterfvNV not found in mesa table OpenGL Warning: glGetCombinerOutputParameterivNV not found in mesa table OpenGL Warning: glGetCombinerOutputParameterfvNV not found in mesa table OpenGL Warning: glGetCombinerInputParameterivNV not found in mesa table OpenGL Warning: glGetCombinerInputParameterfvNV not found in mesa table OpenGL Warning: glFinalCombinerInputNV not found in mesa table

OpenGL Warning: glCombinerParameterivNV not found in mesa table OpenGL Warning: glCombinerParameteriNV not found in mesa table OpenGL Warning: glCombinerParameterfvNV not found in mesa table OpenGL Warning: glCombinerParameterfNV not found in mesa table OpenGL Warning: glCombinerOutputNV not found in mesa table OpenGL Warning: glCombinerInputNV not found in mesa table OpenGL Warning: glVertexArrayRangeNV not found in mesa table OpenGL Warning: glFlushVertexArrayRangeNV not found in mesa table LibGL error: pci id for fd 10: 80ee:beef, driver (null)

There appears to be a problem with OpenGL in the guest extensions. After upgrading from VirtualBox 4.3.12 to 4.3.20, attempting to run a QML application results in the error: 'Could not initialize GLX'.

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