Buttons Stop Working after another is pressed

Hi, I have 2 main movie clips, one for the menu bar and one for the content, there is then a movie clip within each one of those, one to hold the set of buttons, and one to hold the content movie clips.

The menu bar has a control to flip between 2 sets of buttons.

the viva content button works fine to begin with, but after the menu bar control is clicked, the content buttons stops working.

Code is as Follows:

All of the code (bar a few stop() flags on cirtain frames) is located on frame 1 of the root, which is the only frame on the root.

barControl.barContent.barUp.addEventListener(MouseEvent.CLICK, menuSwitchHandle);
barControl.barContent.barDown.addEventListener(MouseEvent.CLICK, menuSwitchHandle);

barControl.barContent.barMenu.vivaBtn.addEventListener(MouseEvent.CLICK, vivaHandle);

function menuSwitchHandle(event:MouseEvent):void {
barControl.barContent.play();
}
function vivaHandle(event:MouseEvent):void {
contentControl.vivaContent.play();
}

Thanks for your time,

Kind Regards,

Peter Chapman