Hey all. I got the same error message as Jenifer and Dorit described earlier. [lips-computer-2:~/Desktop/freesurfer_Julia] Preissle% qdec ERROR: In /usr/pubsw/packages/vtk/5.0.4/src/VTK/Rendering/vtkXOpenGLRenderWindow.cxx, line 219 vtkXOpenGLRenderWindow (0x4921ff0): Could not find a decent visual I get the message three times, but it's possible to open the qdec table after that. I've attached a screenshot of what the Display looks like. Is there anything I can do to solve this problem? I've tried the advices you've given previously, but the message ist still shown. I'm working with FREESURFER_HOME: /Applications/freesurfer Build stamp: freesurfer-Darwin-tiger-i686-stable-pub-v4.0.5 Kernel info: Darwin 8.11.1 i386 Thanks in advance Cheers  Julia