Random chunks do not load unless you relog in this new snapshot
This is a very large one
MC-60263
Random missing chunks
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jacob wrisner
(Unassigned)
Unconfirmed
Minecraft 14w27b
Retrieved
Try opening your OPTIONS.txt file in your MC install dir and check to make sure na option called OPENGL is set to false and not true as i had a very similar issue and that was how i fixed it.