There are a few intermittent battle glitches since the last update, surfacing mostly in battles with a backer and defenders.
Problem 1: Certain towers (mostly blue mages, in my experience) will appear to defenders to not be destroyed, even when destroyed; they persist on the map with a sliver of grey health, probably indicating their status right before they received the final blow.
Problem 2: When the primary attacker watches the backer, it sometimes appears as though all the backer’s attacks occur after the backer’s dragon flies past the island it is attacking.
Problem 3: Usually occurs after problem 1 or 2: at the end of the battle, the game freezes indefinitely and requires a switch to background and return to game to unfreeze.
These do not appear to affect battle results. My team had a war today, so it was pretty noticeable; 4-5 people mentioned it. I have not seen this happen in non-war attacks.