I have gotten the error code "zebra" while playing Destiny. I was attempting to kill a Captain, and I was using a pulse rife, but I don't know exactly which one it was, he was not taking any damage. I followed the steps that your support site gave me, I exited and restarted the beta, but when I reach the home page and after I "click A to play" it gives me the same message before i can choose my character. I realized it was showing an image on screen for a fraction of a second before it would give the error code, so I recorded the game footage, went to the DVR app and watched it, I paused it as soon as it popped up, and it says:
INSTALLING DESTINY
-DOWNLOADING CONTENT UPDATE
-0.0./336.0 KB In Progress
It also will not let me play using my husband's account, he gets the same error message in the same spot from the same console. We are playing on an Xbox One: Day One Edition. It was at about 6:55 EST
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Keep in mind that they're doing a lot of testing in the background as the beta comes to a close. It's not ending just yet, but don't expect it to be stable like it has been previously.