Lighting Cookies don't appear on assets.

Hi there.

I wanted to experiment with making a rotating disco or pattern light inside one of my game levels using a Light cookie. However, whenever I do this, the pattern refuses to show up in my level. Only the light itself seems to have a slight effect on the room, but the pattern is absent. I've tried this on some blank, elongated cubes and the pattern showed up, but not in my room environment level. I've tried this with both directional lights and a cubemapped point light.

Does anyone have an idea why this might be the case? Might the other light sources I'm using be interfering?