Blank card when i update ,from anki desktop to ankidroid

I’m testing the latest beta version of anki, when i installed it’s working normally, but, when i update to ankiweb and soon after to my ankidroid, the front of cards in japanese were blank, when i try to edit, they are normal. When i review they are blank. If i use the tool “empty cards” i will lost all my deck, have other way to solve this problem ?. I tried to use a older version, but the problem continued. Someone can help me please? Thanks again.

I solved the problem using my version on windows, and recover the backup archives in C:\Users\rayar\AppData\Roaming\Anki2\Usuário 1. Adter that i imported the archive and the colecions were normal.