our computer had a motherboard go out last week so i figured it would be best to just get a new pc as the current one was about 4 years old. so, we reinstalled autocad and bobcad etc... now, when i go to open a file in bobcad and say measure a line or translate or whatever... and i mouse over the drawing trying to click, the drawing disappears. and doesnt come back until you scroll the window out. not because its moved on screen. it just "hides" in a sense. then comes back. but, i cant seem to do anything with it. anyone???