Chunks are not loading or sides of blocks in chunks don't load or they unload as I get near them
Happens with any render distance and with VBOs on and off
Steps to Reproduce:
1. Walk around in survival world. Works best if moving fast
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Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report ([minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/crash-reports/crash-<DATE>-client.txt
) here.

Crash report added

I have been getting a LOT of this issue as well in my single player game... it is usually the worst when I am traveling quickly, such as by boat, and thereby forcing a lot of chunks to load in a short time. As I'm moving, many of the faces of blocks simply fail to appear at all, exactly as shown in the screenshots above. Halting my movement and staying stationary for 15-30 seconds usually allows the rest of the blocks in my field of view to appear, but this makes exploration VERY difficult if I have to keep stopping every few chunks to let more of the world load. My computer is fast enough that this has never been an issue before now, so I suspect something in the game code is slowing down the chunk loading or rendering process quite a bit.