Since 14w04a the block occupied by transparent blocks such as tall grass, flowers, fences etc. looks darker, as if shadowed; it looks much more evident with no Smooth Shading. The block's light level seems not to change, though.
This issue is probably caused by the fix of MC-2399
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galaxy_2alex
Cannot confirm
_zombiehunter
Confirmed, attached a screenshot showing dark spots in a plains biome.
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To reproduce the bug, you have to set the brightness to Moody (the lower the brightness, the more visible the bug is).