Today, someone invited me to a co-op LF run, we started the first battle and they stopped responding. I waited about five minutes for them to come back/reconnect and someone else invited me to a team. I chatted with the second person a bit and then decided to change teams (I had already waited more than twice as long as it takes to clear this module). So I clicked "Leave", accepted that my team would lose the battle and abandon the adventure, got a defeat screen with a "Regroup" button. Then I invited person #2, they accepted, I clicked "Regroup" and found myself on the landing screen with no buttons or anything to do. The logs had a stack trace and error #1009. I refreshed my browser, agreed to rejoin my existing battle (which actually put me on the world map) and everything was fine.
