So, I finally won a weekly tournament and when I click the mission icon, sure enough the "Win one weekly tournament" box is checked. However, I have to go back and check the tournament board to get the other box checked. Once this is done the mission is completed and I am awarded the points and money, and the mission box goes away. Great, you say, what is the problem?
However, if I leave the game and log on again, the mission box appears again, and the money and experience have been removed!!! I decided to be clever and use the experience to advance a level (thinking that that would be hard to reverse), but this only resulted in a persistent connection error.