Hi,
yesterday i loaded the 4.3.4 Update and choise as crosshair the "harpoon 3.0 (en)". When i try to play, the game shot down even when it change from startingscreen to first tank view in starting position. That happens 3 times in a row.
After then , i change my choise to Jimbos crosshair and the game worked as well as we know it.
so please check the Harpoon settings, it makes more fun.. THANKS !!!