This must be happening to others. I have not read anything about it so not sure if its a glitch or if the cryptarch will not decrypt until the House of Wolves DLC is released. If anyone has any info on this, please share. This seems to happen only to the encrypted engrams we (my friend gets the same issue) get out of the Ether chests.
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They are HoW engrams and cant be decrypted until tuesday. Its in the patch notes!