I am also having this issue. The sideboarding is freezing during transitions from game to game and everytime I click on a card while in the sideboarding window. It's becoming increasingly difficult to continue playing.
I had a Raffine's Informant with a +1/+1 counter on it attach with the Kutzil, without a +1/+1 coutner, and I didn't draw a card. The previous turn I attacked with the Informant alone and drew the card.
Match #263635529 Game #857766980