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Another circumstance that causes frames to be skipped is
when clients in the Clients List do not have VNS running.
Some testing shows that adding a client into the list that
doesnt have VNS running will immediately output a message
saying "Connection was refused". Further along in the render,
SC will try to send frames to it a few dozen times in a row,
causing all the skipped numbers, and frames to go unrendered.