Using this mod with Dynamic Surroundings causes the aurora (from DS) to flicker and eventually (possibly) lead to gl errors. Issue is avoidable by either disabling the special rendering from Ext. Days, or by disabling the auroras from DS.

To reproduce:

1. Install both mods (you may also want Nature's Compass for next step).
2. Go to a Cold Taiga or similar "snowy" biome (Nature's compass will let you teleport directly to a cold taiga biome).
3. /time set 18000

EDIT: Note for Astral Sorcery Users: AS replaces the sky rendering with its own by default, and the aurora is not visible with AS strong rendering. With weak sky rendering, the auroras are visible again.

With the new update to DynSurr OreCruncher/DynamicSurroundings#214 this should be fixed, but I have not yet verified it.