A desync-bug as been found, I'll post a fixed version (V0.6b) during the week. You can still play the game of course but in some instances, especially at the endgame, the player holding his last card tend to desync with other clients and the server.
The duplicate feature has issues. It would be great to add a pivot system to make the thing easier to use (like the one used to translate) otherwise it's perfect.
