Random chunk (actually section) repeatedly renders all over specific area. When mouse is moved sometimes new section renders all over previous ones.
Different render distances affect different areas.
It does not affect blocks, you can interact with them as usual, bound boxes can be seen.
It works only with VBOs (video settings) ON.

Steps to Reproduce:
1. Set VBOs ON and render distance to 11 or more
2. (go to coordinates -421, y, 216)