Ok, this is a new one on me. I had the silly lock-up thing while doing the tournament. The interface started getting wonky before I tried to exit the tourney panel. Attempting to exit fully locked it up with the dim screen. But the wonky part? The troop selection buttons and other interface things started disappearing as they were being interacted with, but the way they were disappearing indicated that they were still there, just not visible.
Had I known it would've locked up on exiting, I'd have tried to fight anyway despite not knowing what troops I'd be throwing into the meat grinder. Just to see what would happen. I was trying to go for five blossom mages. I hope those floating flowers will be fine