looks like this was light mapped and then the turnOff LM objects in F11 mode.
I have seen this before when doing this, Not sure why it happens, But maybe turn this back on and re light map and see if it goes away.
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, 2400 Mhz, 4 Core(s), 4 Logical Processor(s), 8gb RAM, Nvidia gtx660, Windows 7 Pro 64bit