Button not working...and I don't even know why

Question

I have this on frame 1:
//FRAME NUMBER//
slidenumber_txt.text = currentFrame + " de " + totalFrames;Object(this).
//BUTTONVISBILITY//
a_btn.visible = true;
b_btn.visible = true;
c_btn.visible = true;
d_btn.visible = false;
e_btn.visible = false;
f_btn.visible = true;
g_btn.visible = true;
i_btn.visible = true;
j_btn.visible = true;
k_btn.visible = false;
l_btn.visible = false;
h_btn1a.visible = true;
h_btn1a.setStyle("icon", iconh);
h_btn1a.addEventListener(MouseEvent.ROLL_OVER, fh_btnro);
function fh_btnro(e:MouseEvent):void{button_txt.text = "Interacción";}
h_btn1a.addEventListener(MouseEvent.ROLL_OUT, fbtnrout);
h_btn1a.addEventListener(MouseEvent.CLICK, fbtnclickh1a);
function fbtnclickh1a(e:MouseEvent):void{
    var loadera = new Loader();
    addChild(loadera);
    loadera.load(new URLRequest("lesson1/interactions/interaction1a.swf"));
function fbtnclicki(e:MouseEvent):void{
    var loadera = new Loader();
    addChild(loadera);
    loadera.load(new URLRequest("lesson1/documents/document1a.swf"));
function fbtnclickf(e:MouseEvent):void{
var loadera = new Loader();
    addChild(loadera);
    loadera.load(new URLRequest("lesson1/sounds/audioplayer1a.swf"));
function fbtnclickj(e:MouseEvent):void{
    var loadera = new Loader();
    addChild(loadera);
    loadera.load(new URLRequest("lesson1/videos/video1a.swf"));
function fbtnclickk(e:MouseEvent):void{
    var loadera = new Loader();
    addChild(loadera);
    loadera.load(new URLRequest("lesson1/tests/test1a.swf"));
And this on frame 2:
slidenumber_txt.text = currentFrame + " de " + totalFrames;
a_btn.visible = true;
b_btn.visible = true;
c_btn.visible = true;
d_btn.visible = true;
e_btn.visible = true;
f_btn.visible = true;
g_btn.visible = true;
i_btn.visible = true;
j_btn.visible = false;
k_btn.visible = false;
l_btn.visible = false;
h_btn1b.visible = true;
h_btn1b.setStyle("icon", iconh);
h_btn1b.addEventListener(MouseEvent.ROLL_OVER, fh_btnro1b);
function fh_btnro1b(e:MouseEvent):void{button_txt.text = "Interacción";}
h_btn1b.addEventListener(MouseEvent.ROLL_OUT, fbtnrout, false, 0, true);
Object(this).h_btn1b.addEventListener(MouseEvent.CLICK, fbtnclickh1b);
function fbtnclickh1b(e:MouseEvent):void{
    var loadera = new Loader();
    addChild(loadera);
    loadera.load(new URLRequest("lesson1/interactions/interaction1b.swf"));
I also have this on another layer:
import flash.events.MouseEvent;
import fl.transitions.Tween;
import fl.transitions.easing.*;
import fl.transitions.TweenEvent;
stop();
//STAGE//
stage.displayState=StageDisplayState.FULL_SCREEN;
//CUSTOM MENU//
var custom_menu:ContextMenu = new ContextMenu();
custom_menu.hideBuiltInItems();
var option1 = new ContextMenuItem("© Copyright 2012 Jeje Designs All rights reserved");
var option2 = new ContextMenuItem("+1 787.272.5059 | [email protected]");
var option3 = new ContextMenuItem("Project Title: Presentation System 1.0 Build 1 Release 1 | 01032012");
var option4 = new ContextMenuItem("Devigner: Edwin Merced | [email protected]");
var option5 = new ContextMenuItem("Security Access");
option5.enabled = false;
option5.separatorBefore = true;
custom_menu.customItems.push(option1, option2, option3, option4, option5);
contextMenu = custom_menu;
//NAVIGATION//
a_btn.setStyle("icon", icona);
b_btn.setStyle("icon", iconb);
c_btn.setStyle("icon", iconc);
d_btn.setStyle("icon", icond);
e_btn.setStyle("icon", icone);
f_btn.setStyle("icon", iconf);
g_btn.setStyle("icon", icong);
i_btn.setStyle("icon", iconi);
j_btn.setStyle("icon", iconj);
k_btn.setStyle("icon", iconk);
l_btn.setStyle("icon", iconl);
a_btn.addEventListener(MouseEvent.ROLL_OVER, fa_btnro, false, 0, true);
b_btn.addEventListener(MouseEvent.ROLL_OVER, fb_btnro, false, 0, true);
c_btn.addEventListener(MouseEvent.ROLL_OVER, fc_btnro, false, 0, true);
d_btn.addEventListener(MouseEvent.ROLL_OVER, fd_btnro, false, 0, true);
e_btn.addEventListener(MouseEvent.ROLL_OVER, fe_btnro, false, 0, true);
f_btn.addEventListener(MouseEvent.ROLL_OVER, ff_btnro, false, 0, true);
g_btn.addEventListener(MouseEvent.ROLL_OVER, fg_btnro, false, 0, true);
i_btn.addEventListener(MouseEvent.ROLL_OVER, fi_btnro, false, 0, true);
j_btn.addEventListener(MouseEvent.ROLL_OVER, fj_btnro, false, 0, true);
k_btn.addEventListener(MouseEvent.ROLL_OVER, fk_btnro, false, 0, true);
l_btn.addEventListener(MouseEvent.ROLL_OVER, fl_btnro, false, 0, true);
a_btn.addEventListener(MouseEvent.ROLL_OUT, fbtnrout, false, 0, true);
b_btn.addEventListener(MouseEvent.ROLL_OUT, fbtnrout, false, 0, true);
c_btn.addEventListener(MouseEvent.ROLL_OUT, fbtnrout, false, 0, true);
d_btn.addEventListener(MouseEvent.ROLL_OUT, fbtnrout, false, 0, true);
e_btn.addEventListener(MouseEvent.ROLL_OUT, fbtnrout, false, 0, true);
f_btn.addEventListener(MouseEvent.ROLL_OUT, fbtnrout, false, 0, true);
g_btn.addEventListener(MouseEvent.ROLL_OUT, fbtnrout, false, 0, true);
i_btn.addEventListener(MouseEvent.ROLL_OUT, fbtnrout, false, 0, true);
j_btn.addEventListener(MouseEvent.ROLL_OUT, fbtnrout, false, 0, true);
k_btn.addEventListener(MouseEvent.ROLL_OUT, fbtnrout, false, 0, true);
l_btn.addEventListener(MouseEvent.ROLL_OUT, fbtnrout, false, 0, true);
a_btn.addEventListener(MouseEvent.CLICK, fbtnclicka, false, 0, true);
b_btn.addEventListener(MouseEvent.CLICK, fbtnclickb, false, 0, true);
c_btn.addEventListener(MouseEvent.CLICK, fbtnclickc, false, 0, true);
d_btn.addEventListener(MouseEvent.CLICK, fbtnclickd, false, 0, true);
e_btn.addEventListener(MouseEvent.CLICK, fbtnclicke, false, 0, true);
f_btn.addEventListener(MouseEvent.CLICK, fbtnclickf, false, 0, true);
g_btn.addEventListener(MouseEvent.CLICK, fbtnclickg, false, 0, true);
i_btn.addEventListener(MouseEvent.CLICK, fbtnclicki, false, 0, true);
j_btn.addEventListener(MouseEvent.CLICK, fbtnclickj, false, 0, true);
k_btn.addEventListener(MouseEvent.CLICK, fbtnclickk, false, 0, true);
l_btn.addEventListener(MouseEvent.CLICK, fbtnclickl, false, 0, true);
function fa_btnro(e:MouseEvent):void{button_txt.text = "Salida";}
function fb_btnro(e:MouseEvent):void{button_txt.text = "Final";}
function fc_btnro(e:MouseEvent):void{button_txt.text = "Siguiente";}
function fd_btnro(e:MouseEvent):void{button_txt.text = "Anterior";}
function fe_btnro(e:MouseEvent):void{button_txt.text = "Inicio";}
function ff_btnro(e:MouseEvent):void{button_txt.text = "Audio";}
function fg_btnro(e:MouseEvent):void{button_txt.text = "Glosario";}
function fi_btnro(e:MouseEvent):void{button_txt.text = "Lectura";}
function fj_btnro(e:MouseEvent):void{button_txt.text = "Video";}
function fk_btnro(e:MouseEvent):void{button_txt.text = "Prueba";}
function fl_btnro(e:MouseEvent):void{button_txt.text = "Button L";}
function fbtnrout(e:MouseEvent):void{button_txt.text = " ";}
function fbtnclicka(e:MouseEvent):void{var mc:lessonexit_mc=new lessonexit_mc();
mc.x=479;
mc.y=290;
addChild(mc);}
function fbtnclickb(e:MouseEvent):void{gotoAndStop("lastframe");}
function fbtnclickc(e:MouseEvent):void{nextFrame();}
function fbtnclickd(e:MouseEvent):void{prevFrame();}
function fbtnclicke(e:MouseEvent):void{gotoAndStop("firstframe");}
/*function fbtnclickf(e:MouseEvent):void{var mc:audioplayer_mc=new audioplayer_mc();
mc.x=751;
mc.y=141;
addChild(mc);;}*/
function fbtnclickg(e:MouseEvent):void{
    var loadera = new Loader();
    addChild(loadera);
    loadera.load(new URLRequest("glossary/glossary.swf"));
//function fbtnclickh(e:MouseEvent):void{}
/*function fbtnclicki(e:MouseEvent):void{button_txt.text = "I";}*/
/*function fbtnclickj(e:MouseEvent):void{button_txt.text = "J";}*/
/*function fbtnclickk(e:MouseEvent):void{button_txt.text = "K";}*/
function fbtnclickl(e:MouseEvent):void{button_txt.text = "L";}
Button h_btn1b does not work....I wonder why?

Answer 1

Do you get any error messages? 
Try putting traces in the h_btn_1b function to see if it is working.
If h_btn_1b is in a frame adjacent to h_btn_1a and they are the same symbol, it is possible that b has been converted to a.