Flash :: AS3 MouseEvent.MOUSE_MOVE Event Stops Responding After MouseEvent.CLICK Call?

I have several stage event handlers to enable mouseovers over several dynamically generated moviecilps on the stage that then change their alpha to indicate the mouse is over that particular mc... fairly trivial (mcOver handler). Additionally, I also want to know what MC is clicked, so I update a public variable (public var activemc:Number) with the ID of the dynamic movieclip when the mouse is over it (using a hitTest to check, which is why the EventListener is added to stage and not to the MC), which is checked in the mcClicked handler:This is in the constructor:

//stage.addEventListener(MouseEvent.MOUSE_DOWN, startDrawing);
//stage.addEventListener(MouseEvent.MOUSE_UP, stopDrawing);
stage.addEventListener(MouseEvent.MOUSE_MOVE, mcOver);[code]....

However, the mouseover behaviour (alpha 0 when over, alpha 1 when out) stops working as soon as I click on any movieclip on the stage, and the mcClicked ID checking (below) stops working completely. I don't know if this is to do with focus:

private function mcClicked(event:MouseEvent):void {
myTextField.text = String(activemc); // activemc is a public var:Number with the movieclip //ID
}

I then tried adding the event handler for the stage mouse_move again and this gets the mouseover working again but only for 1 more click, after which it stops again:

private function mcClicked(event:MouseEvent):void {
myTextField.text = String(activemc); // activemc is a public var:Number with the movieclip //ID
stage.addEventListener(MouseEvent.MOUSE_MOVE, mcOver);