I'm honestly not sure why that's the case. This only happens when you have already loaded a game with another partner. Basically, we mark the assignment ID as "used" for your worker ID when both players press "ready to start game". So maybe MTurk is somehow duplicating the assignment IDs? Make sure you're clicking the link from the HIT page itself rather than simply reloading the game page -- I actually realized we have an instruction at the very end saying to reload... I should probably remove it at some point.That's very kind of you, thanks. I just had another one say I was already connected. Perhaps it's best to wait a few minutes after finishing to start another?