When rendering an interior scene in Max 2014 that's only illuminated by 3 photometric lights, I get artifacts in the form of colored squares. When I render on the Medium setting, there are a lot of bright green squares throughout the render. When rendering on a low setting, there are fewer squares and they are a less intense color. The squares are fairly large and they appear at different locations each rendering. Does anyone have any ideas how to fix this? I can't post the renders in this thread for some reason. The tiffs are less than 2 mb but it's telling me the file is invalid.