So I updated the game to V1.2 as steam requested, but as soon as I downloaded the update and loaded the game, it still said V1.04. Anyhow I verified game cache and then it replaced 2.5GB worth. I played in an event after that for an hour then closed the game, however, when I launched the game up 15 mins later for a groupfighting match it reverted back to the old version. No matter how many times I verify game cache it still reverts to the old update as soon as I close the game. To me it seems the only solution is to reinstall the game, however naturally I would prefer a better solution :p
Many thanks