When I'm facing towards negative Z, a small part on the left or right is not rendered (see: 2014-08-05_21.59.52.png). You cannot look through the world like a not rendered chunk.
When I look towards negative X, it all loads perfectly (see: 2014-08-05_22.00.04.png)

Whenever I cross the chunk border, from chunk x27 to chunk x28, it works perfectly (see: 2014-08-05_22.00.28.png)

When I break the two block in front of the Granite blocks on the left (see: 2014-08-05_22.14.54.png), it does not happen.
That block is on X border of the chunk: block 0 3 15 in -17 3 27

Edit: only tested it on the latest snapshot.