It's weird that the chunks just won't load at all. I've seen this lag glitch before on the Rooster Teeth Let's Play Minecraft videos but it always resolves itself. Maybe a cache clean would solve the problem.
Hopefully it'll resolve itself the next time.
In the meantime here's a few things I built from googling minecraft:
Since those photos were taken I've added G-Man and Gordon Freeman next to the Companion Cube. I'll hopefully be adding a Nurse to the Pyramid Head area and possibly Chris and Jill to the RE mansion.