Either when I go in the Card and hit the Move button or when I go in the "..." of the List and click on "Move List" to a new board, the Card or List disappears for some seconds (with a message "Sending...") and then appears back, with an error message "Failed when moving card" (may not be the exact messages, I've translated from Portuguese "Enviando..." and "Falha ao mover cartão").
I've tried with different boards.
Any help would be appreciated. Thanks.