It happens in the overworld as well. That's actually the primary place we get the fault, but we did get it twice of our RFTools dimensions yesterday as well.
#m188,#L254,T409,s365,M340,e429,f418,S399,d178,d179
Digits: 01
Terrain: TERRAIN_NORMAL
Baseblock: Stone
Base fluid: Water
Biome...