Unable to exit victory screen

This is from daemon2470's comments in chat. At some point shortly after creating his account (and I gather prior to refreshing his account) he won a match, and was winning an azure dragon from the AI. The exit button did nothing. He proceeded to mash on the exit button for a while hoping it would do something. He eventually refreshed and was then able to play as normal (including getting past the victory screen) leading me to believe that the problem was related to it being a new account that hadn't logged out and back in yet (which I've had problems with in the past in regards to shit like decks not saving until a new account logs out, refreshes, and logs back in).

Funny story, when he got back, he had 159 azure dragons from that exit button mashing.

edit: additional information: apparently, he had a problem where he couldn't exit the victory screen, so he mashed the pvp/trade/reward buttons, one or more of which eventually took him away from the victory screen and back to the main menu, at which point he had another battle and got into infinite free cards from the victory screen. unrelated

edit2: Have reproduced myself

edit3: Problem is tied to new accounts, disappears upon logging out and logging back in. Console sez:
edit4: I can reproduce this on demand if you need additional information. Also, in red herring news, the "library" button can be used to get you out of anything (including the middle of a battle or a bugged victory screen) and into the library view, and has nothing whatsoever to do with this error.