Hi there! This is almost always a card template problem, something in the formatting is probably hiding all the content?
You should examine the card templates:
https://github.com/ankidroid/Anki-Android/wiki/Advanced-formatting
-Mike
Recently, I've got a bug. The application doesn't show cards at all, neither question nor answer. It shows blank screen with interface (answer buttons, timer and statistics) --
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But did you verify? Definitely check, the old decks may be using the same template, they are shared across decks if they are in the same deck options group
You may also try the new 2.16alpha releases just in case that has
an effect https://github.com/ankidroid/Anki-Android/releases
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