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Help me figure out what I did wrong? French Silk Pie FAIL.

http://www.seriouseats.com/recipes/2011/07/how-to-make-french-silk-chocolate-pie-recipe.html
I followed the recipe exactly. Twice. Each time, when I streamed the chocolate into the bowl with the yolks, it seized up and there was NO way it could be folded into the whipped cream.
Any thoughts on what I did wrong?

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