Can't use lands the turn I play them. I played a Brawl game where the game kept autopassing as if I didn't have enough mana to play the spells in my hand. By turn 3 it became apparent it wasn't registering the land I had played that turn as being an existing land. (So t3 it would let me play spells with 2cmc or less, but not the one with 3.)

This was an unranked game and not part of an event, but it was clearly an issue with the game and not my PC, so I wanted to at least bring it to someone's attention in case its happening to someone other than me.