[Mindspank]

Its possible that your videocard has a slight issue rendering lighting in fiesta. If it was a texture issue, the textures would not be there at all, but if you look closely through all the psychodelic-ness, you can see the textures. So its entirely possible that the lighting layer that is applied over the textures is what gives you that weird look. The robo kq uses the same textures as the second floor of luminous stone so try dropping on by LS2 and see if you can recreate that. If you cant recreate the error outside of the KQ than it still might be a problem with your videocard drivers and the lighting renderer. Robo KQ uses that funky red light at the center of the room.

Try updating your drivers for your graphics card.