You main movie name is "calculator" and child movie where buttons and functions are is named "movie"... now, buttons try to call function from main "calculator" movie,..wont work as there is no functions to call. Buttons should call "movie" functions, see the script in "movie"..
It's no a stupid question, it just happens that latest 3dfa seems to have little unfinished things that cause that. I tried same, exported calculator as .swf and imported it to new movie. It wont even show... then I imported calculator .movie to new movie.. it seems that it automaticly changes calculator "actions" to point main movie (problem you wrote in 1.st post)
So, best bet is now just use .movie import and fix action "addresses" as needed..