Pretty serious bug here...Can't play the game

On the new client. On the latest 6.24-346... update. Pressing 'Play' causes an unknown error to be occurred and disallows me from pressing Play anymore. But it allows me to check anything else. Basically, it's like an app on your phone, not a game.

EDIT: Initiated a full repair and the issue continues EDIT2: Restarted my comp and it works again. Still, it's an issue to be fixed.