Card Glitch in Cities and Knights
I can't remember what the card is called, but its the yellow one that you use to force another player to trade one of their development cards for a resource. Well, I used it in city and knights on another player traded them a brick and got a brick back.
The card is commercial harbour. Should force player to give commodity for an offered resource. It does not work. Only allows player to give back a resource!! It is a definite bug!
As mentioned in another topic. We are aware of this issues and are currently addressing it. A fix should find its way into the game in upcoming updates.