I have it too. Win 64, I7 920, ATI 7979. Like I said in the thread in tech support, I also have this in the scen editor on a map I've been working on.
Question: Do all the maps that are affected use the Ditch Lock function? I'm sure it's nothing, but I notice this quick battle map uses is, as does my map. My other maps that don't use it don't have any problem.