I click "create server", get new menu, try to start map, it just says "Starting up..." Nothing happens. No problems (so far) when I join servers, but I would like to create empty server, so I could practice maps and moving. Do I have to download some extra files to start a server? Could someone post a detailed info, how I could start an empty map, how should I set those options: pure server, dedicated, auto download, synchronous client etc.