Cannot change name servers for domain

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http://serverfault.com – I have two domains that refuse to accept changes to the name server records. One domain has had this problem for 6 months and the other just did this today. I use DreamHost as my domain registrar and I am trying to set Hurricane Electric as my name server. When I go to set the name servers for these domains, I get no problems from the DreamHost panel, but even after days I am unable to detect any progress on setting the name servers. It acts like the domain isn't registered when I query for records about it. The two domains are colorpick.in and darkfission.net. I set the name servers to (HowTos)