My card should be ok because I've used it many of times. I did try the "F" key and in the (4) view it works fine. My camera is set to 100,000. Sometimes, if i go into 4 view and stretch one of the views as large as possible, the work shows up when I hit the space bar to open that viewport, but I always have to re stretch each viewport. I still can't just click on a particular view and get it to show up.