Since the patch before last, on two of my characters, both of whom are playing in the DC alliance I have noticed that a lot of enemies are running behind the environment again as they try to back away from you.
They are running behind doors mostly, sometimes a wall. But either way, once they pass that threshold they can attack you, but you can no longer attack them.
I know my characters can be scary and all, but I thought this was something that was supposed to be fixed a long time ago.
Far too many characters to list any more.