The problem after the latest update is upgrading walls. Wall level 6 to level 7 cannot use elixir anymore. Due to that, many people has less gold than the elixir because their gold need to spend on the defensive like mortar, cannon, archer towers, xbow and so on. Hope you can fix it as soon as possible.
Here some of the problem.
http://imagizer.images♥♥♥♥.us/v2/150...661/VBHP3c.jpg
https://image h a c k.com/i/idVBHP3cj
"h a c k " must close

