I've never had any problems with my ST2000xcm and all computers used with it. However, our college upgraded all computers to Win7, including at our observatory, and I downloaded the latest CCDOPS and drivers. I also installed the latest ASCOM. All seemed well and connection happened normally, no error messages.... but when I got to the point of doing my exposure, and clicking on a suitable guide star, the little box which has always contained the guide star, now shows nearby blank sky instead. It's not dead pixels, the pixel values update with each exposure and behave in all ways just as if the camera simply didn't center that box on the selected guide star, but somewhere else on the sky instead. Even putting Deneb on the tracking chip and trying to guide on it, but it looked the same. I tried clicking on 'auto' thinking the exposure might be off, but that didn't help. This started with the old original drivers that always worked fine on the old WinXP machine. So then I updated the drivers. No change. Next I'll attempt to just go back to the old setup.exe for the older CCDOPS and hope it works fine as it always to. But that's not a real answer. Anyone else had this issue? I don't see it on the topics list.