Since you reommend to use chrome I tried that. When I entered the test game I got to the new hero screen where I could pick a hero, name him, but pressing OK only made the button invert but nothing else happened, the new hero window stays up. After pressing Cancel I get into the game but have no starting city, all neutral. Same happened to me when I tried to play a first turn in a FFA 8-player game.
Thats why I continued playing in FF - today there was a FF update, since then the same as described above happens in FF, cant play the test game - couldnt try it in a normal game yet, but will do so once I get to play a turn.