I just had a game freeze up on me.
I had been offline for a few hours, then got back online, clicked 'deal', got a couple of queens, held the two queens, clicked 'deal' again, and saw an error box pop up in the bottom right. It was too quick for me to screenshot it, but here's how the screen looked after it had gone. I tried talking in the chat box, but my message didn't go through:
Then, while I was typing this message, the screen updated to look like this:
I didn't get to see my new hand, but judging by the balance it looks like I got a 3rd queen. The "THREE OF A KIND" line isn't white like it would normally be after a win though, so I don't know what happened. I think that's my name it is welcoming in the chat, so maybe it thinks I only just joined, whereas really I've already played a game before the welcome message showed up. And it's not normal to see the 'backs' of cards except before your first game.