Dinnerbone said he fixed the lighting glitches on world generation, but I've seen a few cases where it persists. The attached screenshot has coords and seed, and the terrain is on amplified.
Environment
Vista, Java 7, Core 2 duo, old nvidia card, although I doubt this is important to the bug
1) Jeb_ fixed this 2) Jeb_ said he did not completely fix this, but it is mostly fixed, which is good enough. TBHT I haven't seen any lighting glitched on mountains, only around lava pools.
Duplicate of MC-29490