I have noticed this and it seems to be related to buff blocking by other buffs. When I get the interrupted message I start removing buffs and recasting until I find the one that is blocking it. I don't remember the message that is supposed to appear when this occurs in live but on my server it always just says its interrupted. Try removing all your buffs and casting the spell to see if it completes. If it does then one of your buffs was blocking it.
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