I was in SvS the other day and the crew were firing at an enemy ship that was on my compass, but completely gone to me (everyone else could see it - and im not just blind lol) Is that the invisible thing? When i fired it fired as if there was nothing there too. I have a lot of problems with not seeing their health bars but i'll try the ramming speed.
As for the Poll, in my opinion i hate the cheating, but i've been on many crews that have used the glitch and we lose it when we sank. So to fix it, get a good crew and just sink them over and over and get someone to use grape shots. That's the way i've found to stop the people repairing while sailing

Very effective, once you've killed them a few times they learn to stay away from you; as if someone uses grape shots it stops them from repairing too giving you enough time to sink them and teach them a lesson that you don't need a glitch to be awesome. My guildmaster and i sunk 120 ships in a row when SvS first opened and that was when all the glitches were undiscovered. It's just a game, people get too serious with all the cheating and spies and everything it's rediculous.