Flash actionscript displaying a subnav bar but after clicking all movie functions stop working?

I am using the following code to tween movieclips when the user clicks on a button within a menu movie clip and all is working untill I add "menu_MC.gotoAndStop("oidirectNav");" on the code for the second button this works and displays a subnav bar but afterwards all menu actions just stop working? any sugestions welcome as to what is going wrong... below is the code I am using (using the fuse ZigoEngine for the tweening)...


import com.mosesSupposes.fuse.*;
ZigoEngine.register(Fuse,PennerEasing,FuseFMP);
// loads menu bar
this.attachMovie("menu_MC", "menu_MC", this.getNextHighestDepth(), {_x:50, _y:515});

// HOME  ------- plays movie floor code
this.menu_MC.homeBtn.onRelease = function (){
      //ZigoEngine.doTween( '_x,_y', [0,-625], 1, Strong.easeInOut);
      ZigoEngine.doTween( Home_MC,'_x,_y', [0,0], 1, Strong.easeInOut);
      ZigoEngine.doTween([AboutSection_MC,Clients_MC,newsRoom_MC,oiadvertising_MC,recruitment_MC,oidirect_MC,ContactUs_MC,Portfolio_MC], '_x,_y', [0,625], 1, Strong.easeInOut);

      //this swaps the depths ------------------------
_root.x +=2;
// change movieclip ref below to current floor ---------
_root.Home_MC.swapDepths(_root.x);
//oiadvertising_MC.swapDepths();

} // end of floor play code


this.menu_MC.oidirectBtn.onRelease = function (){
      ZigoEngine.doTween([Home_MC,AboutSection_MC,oiadvertising_MC], '_x,_y', [0,-625], 1, Strong.easeInOut);
      ZigoEngine.doTween(oidirect_MC,'_x,_y', [0,0], 1, Strong.easeInOut);
      ZigoEngine.doTween([newsRoom_MC,Clients_MC,recruitment_MC,ContactUs_MC,Portfolio_MC], '_x,_y', [0,625], 1, Strong.easeInOut);

      //this swaps the depths ------------------------
_root.x +=2;
// change movieclip ref below to current floor ---------
_root.oidirect_MC.swapDepths(_root.x);
//oiadvertising_MC.swapDepths();

// moves the menu to subnav label
menu_MC.gotoAndStop("oidirectNav");
}