Dropdown menu glitches

OK here’s the problem. I’ll see if I can explain this correctly. Below are both links to my .fla files. One in which the dropdown menu works correctly and one in which it doesn’t. In both there are movie clips called “Dropdown” that control the drop down menu (the dropdown menu is drops down from the word “design” on the stage. In the working one I have the “books” button active and it leads to a scene called “Design-book”, at the present time that is the only button that is active. This functions fine.

Now when I try to add an action to “posters” in the dropdown menu, all of a sudden the dropdown menu gets all glitchy and disappears a lot of the times while trying to scroll through it.

What my guess is to whats causing this: the “books” layer has a tween that is a movie clip and then that turns into a button as the movie progresses (after the tween is finished), the action to go to the scene “Design-book” lives on this button and it works properly. Now, on the “posters” layer, the tween and the frames after this are a movie clip. But here goes another problem with this, when I try and make the frames after the tween a button, it won’t work . The same things continues to happen. I don’t quite understand why this is. Anybody out there with some ideas?

I’ll post the two .fla files here

http://www.realgone.org/weegs/workingmov.fla

http://www.realgone.org/weegs/notworkingmov.fla

Your help will forever be appreciated

thanks greg