Blender 2.66 test build Dynamic Topology Artifacts
Build 54336, default scene with ortho turned on.
Artifacts can be seen at around 0:26. The garbage produced is random, sometimes the 3D view will be 'split' in two with the right side being a flat colour with artifacts throughout. Rotating the view leaves the artifacts in place.
When I first produced the issue I saved and when I returned to the 3D viewport, the artifacts were gone.
I've submitted a bug report here:
http://projects.blender.org/tracker/i...