That looks like an issue that the OpenGL driver has on some graphics cards when drawing wide lines. If so, you have a couple of options. Here are a few:
- The simplest is to disable the edges and just use the fill color of the markers:
plot(randn(1,120),'o','MarkerFaceColor','black','MarkerEdgeColor','none')
- Another option would be to tell export_fig to use the painters renderer.
- Starting MATLAB with -softwareopengl might help, but I think that the Microsoft OpenGL implementation in Windows 7 is one of the ones that has this issue. Perhaps you're already getting that one. What does "opengl info" report?
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