Light is not rendered out half of the time. During the night, 15 levels of light comes from the sky. And sometimes, if your near some glowstone, torches, or anything that produces light, there will be none. (As seen in the picture, and yes, the glowstone blocks on the right were also placed while in the version.)
Environment
Windows 8.1 v6.3 (Build 9600) 64-bit
Intel Core i7-4700MQ
12GB DDR3L 1600 SDRAM
NVIDIA GT 740M
Window Resolution: 1366x705
32-bit Java v.1.7.0_65
(40fps is due to frame limit)
Duplicate of MC-3329 and MC-911.