Check to see if the dropdown menu is hiding out on a DIFFERENT screen:
I had the same problem (with Fredo6 animator). I tried everything, even completely uninstalling Sketchup and reinstalling it, but I still couldn't see the dropdown menu for Animator, even though in the View>Toolbars menu it appeared there, and the checkbox was checked. Finally I saw that it was on one of my OTHER screens, not the screen that Sketchup was on (the dropdown was pretty tiny, and I have three different screens). All I had to do was drag the menu over to the screen with Sketchup on it.