After I took my first mission, I got trapped inside the mission's dungeon. There is a dead end room in the dungeon that has a strange dark green swirling stuff. It goes horizontally inside its own room with three doors leading into the room. I went inside the room to see what the green swirly was all about, and when I tried to leave the room, I couldn't. There was a kind of invisible wall blocking all the doors. So now I'm stuck in the first dungeon, and I've tried everything I can think of to somehow get out. Has anyone else had this problem? How can I fix it?