I've been playing fine for days and now for some reason the screen turns black randomly. The game is still going but everything is black. I can still hear everything going on and if I click around on the mini map it goes back to normal until I click back where I was. I just noticed that it starts by my units having black lines trailing their movement then...all black. Like I said, it was running fine for a few days, so I don't think its my specs, but I have win7 x64, 6gb ddr2 ram, 2.6ghz dual core CPU and nvidia geforce 8500gt video card. I've tried a mix of video settings from low to high. This is weird. Has anyone else had this prob? Know of a fix? I've heard that this is a known issue, but I haven't found a solution.