Adding a data point for reproducing:
Version 1.8
Ubuntu Linux 14.04
Seed -505506340
On day 1, I dug a tunnel into a rock wall at (67,79,303) for the night. I placed a cobblestone block at the lower half of the entrance to my tunnel. When I stood adjacent to the cobblestone and looked out (south) from my shelter everything rendered normally until I lowered my crosshair past the center line of the cobblestone block. At that point, a chunk directly in front of me dropped out of existence. The issue was easily repeatable by wiggling my crosshair up and down past the center of the cobblestone. Screenshots attached ahg1 and ahg2 demonstrate the issue.
The seed is -505506340. I just recreated the world and reproduced the issue by running straight to the point I mentioned above, digging a 3-deep tunnel, and placing a block of dirt at the foot of the entrance. It's right next to an open-air lava outpouring.