Scrollers stop working

I have created a flash file using scrollbars on 3 different frames to show three different text files. When i load it up first, the scrollers work fine, but then when I try to return to the frame again after viewing another frame the scroller stops working and i cannot move it up or down. Does anyone know what i’m doing wrong?

here is a link to the fla source file:

Oh ye i forgot you’ll need the text files in order for the boxes to work. so here they are.