OS X 10.8.5
Blender 2.69 Hash: 2b9702f and previous
Short description of error
It seems randomly Blender displays wire mesh openGL bugs now.
In edit mode it is not visible. It is mainly visible in wireframe object mode.
However switching from wireframe to shaded can keep the artifact.
Switching to shaded and move/pan rotate or zoom view fixes it in shaded mode but NOT in wireframe.
Exact steps for others to reproduce the error
You are in shaded view object mode enter edit mode exit edit mode all is fine.
You are in wireframe view object mode, all is fine, enter edit mode, exit edit mode and in object mode it will be corrupt.
Here is a link to a screen cast: