No. It should be on by default and as long as you've run the VoxATC indexer and your airport has a valid AFCAD file (which they all should) then you should see the lights appear drawing out the path to the terminal or the runway. Also, are you filing a full flight plan? It shouldn't matter but just in cast, be sure you have a flight plan loaded when you turn on VoxATC. If all else fails I can only recommend you send a message directly to the creator. He gets back with people fairly quickly.