I know that the chaingun was fixed against illigal modifications, etc... but my new chaingun won't go through it's muzzle flash animations

. When you fire it just sticks on the first flash animation. It's basically just modified graphix, which operate identically to the old chaingun but it fires faster and it slows down after you fire (like the quake 2 chaingun). How can I solve this?
Oh, by the way, I'm using beta 59.
