Black/Too Shadowed Chunks with Mods
With some mods chunks can be all dark, I checked if it's wasn't a specific biome/mod that add biome but that appear in vanilla biomes too. Here is a redit post that report the same problem but he said he fixed it without explaining how 
... https://www.reddit.com/r/feedthebeast/comments/13yht9z/distant_horizons_how_do_i_fix_this/
... https://www.reddit.com/r/feedthebeast/comments/13yht9z/distant_horizons_how_do_i_fix_this/
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