My opponent played a room card (Walk-In Closet/Forgotten Cellar) which caused the UI/graphics of the board to completely crash. This card started it and afterwards I was able to right click it to show the card which had a big red caution sign on it.

After this card was played, every card played afterwards just endlessly stacked on top of one another on the righthand side that shows the cards played.

I was unable to interact with the battlefield at all. My hand seemed unaffected, and I was still able to play cards. I was still able to "All Attack" using spacebar and the bottom right UI.

Playing a card that targeted a card on the battlefield resulted in having to wait for the timeouts to be used since I could not click on anything.