I know in June 2009, Tarzan's Treehouse closed at some point before, during, or after Fantasmic! and was closed the rest of the night. I know because Ridemax advised me to go through it then and it was not open!
In November 2011 it was open before Fantasmic!, though. I have photos from inside it at about 8:30 PM. I'm not sure if it closed later or not.