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I actually have the exact same problem with Distilled :(. Sadly - there doesn't seem to be a way to fix it at the moment, for reasons I genuinely cannot comprehend. I'm assuming the YouTube teams and the G+ teams basically aren't talking to each other at the moment, because - surely you should be able to merge accounts once G+ and YouTube became integrated. Alas...If I hear anything, I'll let you know - but right now I've got the same problem. Sorry to be the bearer of bad news!