I have been playing a mission on Venus, were your Ghost scans the Vex Mind and tells you that they can warp everywhere in an instant and they share 1 Mind, that's why they react so fast.
Anyway I was just playing and on the 2nd wave I got a Black Screen with an Error Message with the Code ZEBRA.
Time of it Happening 22.00 GMT; Platform XBox 360; Has not happened before (I think)
Well that's all Help.bungie.net told me to write and I don't have anything to add.
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The zebra error code is still an ongoing issue, bungie updates its error pages regularly, check here: http://www.bungie.net/en/Help/Article/11660