The page and game is fully loaded but I can't see any cards; that is, there are no card back images, just blank white space. When I click "Start Game" it flashes the number side of the cards and then goes ahead (I assume) but I can't see anything. Then it reaches the "Click the black ace!", and when I click in the blank space where a card would be, it goes to the final result page and the number side of the card is fine.

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Same issue here! But when the game started it only showed me the number side of one of the cards before returning to white.

I can see the card images fine, but it doesn't show me any of the card fronts before the cards start shuffling (just blank white space before the cards start mixing), therefore I have no way of knowing which of the three cards is the black ace.

screenshots

Before starting game, everything looks normal

After clicking start game, cards disappear/the card faces don't show

After a moment with a blank image, the cards reappear and shuffle, game continues as normal

Amber mentioned that the coders looked into it and fixed it in the news comments, but no dice.

I'm on FF 36.0.4 and tried disabling any addons that might interfere. Nothing. The only way I've gotten the games to work is to boot up Chrome.

Same thing happening for me the last two days. I always just guess anyhow, so it doesn't change much about how I play the game. I'm using the most recent version of Firefox and I refuse to switch back to Chrome since there are other far more intrusive bugs for Subeta when I use Chrome.

I just tried it again and it seems to be working fine now!