Same here.
My solution is just waiting for 3-5 minutes and don't click 'Try Again', then a server connection error shows up, clicks the button to reload, done.
I attack this guy in a mutilplayer battle, and I found most of his defending buildings level are so low.
Is it possible to keep resources by such low level defending buildings and upgrade to Industrial age?
I don't hack the game and my score is over 1000, but my medal icon is sometimes gone and I can't get the dock rewards. Only after a mutilplayer battle, the medal come back and everything is normal.
Why? Is it a bug?