I'm having some wierd rendering problems. The file renders the scene properly until it reaches to a specific frame then the material seems to start crashing. I've attached two frames. Frame 174 and 175. 174 is what it should look like then after 175 the dielectric material goes transparent. Here is the error I get in the RenderLog.
Warning: line 1: Unrecognized node type for node '_areaLight1_mrLoc'; preserving node information during this session.