I don't know where and I don't know how fast you were at re-starting CFS3 but I get that often when using the model viewer. To close the process, open the Windows Taskmanager (CTL ALT Delete), go to the process-tab and end the process. It's all I can do to help you. But give CFS3 at least a couple of seconds to close the process by itself before trying to re-start the thing (doesn't work for my problem, though).
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