I am HO for my guild and I am able to "sticky" topics in our guild forums but unable to "unsticky" them. There is no drop down menu option on the first page of the guild forums to "unsticky" either. Shouldn't you be able to check the thread box and "unsticky" there? If not at the very least inside the thread it should work but when it is used there nothing happens.
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Peace, Luv & Cookies,Inifuss