Played in the "Yargle Day in Space" event on Mac. When I cast a spell the cascade wouldn't work correctly. Sometimes it would stop on a card with the same or higher cmc than the spell I cast and ask if I wanted to cast it, with no option to actually do so. Pressing "resolve" would just send the card back to the deck. The way it should work is, "To cascade, reveal cards from the top of the library until you reveal a nonland card with a lower CMC. The cascading player may cast that nonland card without paying its mana cost." This problem occurred in multiple games during the event.