I'm playing with google chrome, and at least one member had the same problem: sometimes it reloads and my village is all black, the menus are there, though...
to show yhat i mean:
http://prntscr.com/dqcyb8There is a second problem it seems: resources in independent cities don't get refilled...
http://prntscr.com/dqe1bbI've checked at least one of them (2533), it's not a vassal or something, and it didn't get any resources for an hour now.