This has only started happening since the latest development version but every time I try to disable vsync the game immediately freezes and has to be closed via task manager, I have also tried turning vsync off via the config file which causes the game to crash on start. Further measures I have taken include deleting the config file and reinstalling the whole game. Personally I find this quite a major issue this close to release as I prefer the extra fps with vsync turned off but I find it very strange why this problem has only recently started occurring.