No they aren't. They show up as white blanks with question marks. If you double click them you can see most of them, but I wouldn't bother making a deck until they have the kinks worked out.
Hm. Yeah, it's not as convenient as you would hope, but it's a step forward, and certainly better than having to proxy cards imo. And like honchvire said, shouldn't be long before it's all fixed.
