Board Thread:General Discussion/@comment-24577221-20151104164336/@comment-24577221-20151112165256

Actually, you can log off properly. It's a matter of pressing the "exit" button repeatedly. Eventually, the "are you sure you want to exit?" message appears. Or at least that's the way it works for me, in BlueStacks. You might find that that helps.

This suggests to me that the game is creating overlays -- every time you click on a thing and a new menu appears over the background, which darkens -- but not clearing them properly.

Mind you, even with the game logged off properly, when I start in another device, I'm told that the game is still logged in and I need to kick off the previous device. Clearly the game isn't properly terminating its connection with the server.