Hi,
I have the same problem too. Here is how it happened to me. 4 or 5 days ago, I received a notification on my iPad Air (latest iOS) that my base had been attacked. I started the game to see my camp. I got the notification that the base was still under attack and I had to wait for 30 seconds. After 30 seconds it started loading the game again but as soon as it got to around 90-95% it crashed. After that every time I try to initiate the game it crashes at the same point. If I log out of my game centre account and start the game with another account it works but as soon as I log back into my own account same thing happens. As others have mentioned, using my iPhone doesn't solve the problem either. It crashes on all my iDevices. There is no way I am going to use a new account. If you can't fix the server-side problem, please let me know how I can proceed to get my refund for the in-app purchases.
FYI, my ID in the game is Manhoud but I don't remember that 6-8 digit number which is I think player's number or something like that.
P.S.: Honestly, I think I was wrong in thinking that CoD was better that CoC. You support and maintenance of the app is neither acceptable in any sense nor on par with CoC's.
P.S.: Here is a screencast of what happens when I start the game. CoD.mp4