AttachMovie is shown on debugger but not on play

Question

I'm using the tutorial XML photo gallery with thumbnail from http://www.kirupa.com/developer/mx2004/thumbnails.htm
I'v added code to deal when the image is not aviliable I attach a symbol with Text instead to the thumbnail and to the photo as well
the problem is when I have an image as photo and I press a symbol thumbnail it dosent attach the symbol instead of the Image.
it doesnt work at all.
my solution for that was to unloadMovie and it solved partly
thumbNail onRelease activation
  target_mc.onRelease = function() {
   if (!isdef[p] && isdef[this.pictureValue]) {
   //if the old MC is image and the wanted new MC is a symbol
    picture.unloadMovie();
   p = this.pictureValue-1;
   nextImage();
The nextimage function does the load of the picture or attachMovie for the symbol
function nextImage() {
if (p<(total-1)) {
  p++;
  if (loaded == filesize) {
   picture._alpha = 0;
   if (isdef[p]) { //use defualt symbol instead of a photo
    picture.attachMovie("mcDef", "mcDef"+p, 1000);
    picture["mcDef"+p].m_text.text = reverseString(description[p]);
    picture["mcDef"+p].ref_text.text = reverseString(description[p]);
   } else {
    picture.loadMovie(image[p], 1);
   picture.pictureValue = p;
   desc_txt.text = description[p];
   picture_num();
Nothing is show and no instance was made of the symbol and when pressing again on symbol thumbnail it then works and all is well
BUT on debugging it does work on the first time and I dont have to press twice on the symbol!
it probably caused that there was no load when attaching so veriables  loaded and filesize has no maning in the logice .
doing unload is a work around the problem does any body has an idea how to deal with this ether with the unload or better off without.
i'v attached the fla file so you can see the code
10X

Answer 1

the alpha is returen to 100% late on in a loop:
this.onEnterFrame = function() {
filesize = picture.getBytesTotal();
loaded = picture.getBytesLoaded();
preloader._visible = true;
if (loaded != filesize) {
  preloader.preload_bar._xscale = 100*loaded/filesize;
} else {
  preloader._visible = false;
  if (picture._alpha<100) {
   picture._alpha += 10;
I'v printed out the alpha and on every click on thumbnail it increments by 10 untill more then 100% thats OK
this ia the print out of list veriables:
1. the image is selected
Movie Clip: Target="_level0.picture"
Variable _level0.picture.onRelease = [function 'onRelease']
2.pressing on symbol thumbnail clears the screen after unloading the image but symbol doesn show and picture._alpha=107.999
Movie Clip: Target="_level0.picture"
Variable _level0.picture.onRelease = [function 'onRelease']
3.pressing on the thumbnail of the symbol the second time and it shows
Movie Clip: Target="_level0.picture"
Variable _level0.picture.onRelease = [function 'onRelease']
Variable _level0.picture.pictureValue = 2
Movie Clip: Target="_level0.picture.mcDef2"
Edit Text: Target="_level0.picture.mcDef2.m_text"
    variable = null,
    text = "ןיינב",
    htmlText = "ןיינב",
    html = false, textWidth = 114, textHeight = 73, maxChars = null,  etc...........
so it looks like that it didn't load the symbol on the first click even though it goes through the code that attachMovie()????
But if I run this in debbug mode codeline by codeline it loads the symbol and shows it on the first tril.
here is the printout of the run test mode:
picture.loadMovie(image[p]); <==  loading the image after clicking the image thumbnail
picture._alpha=0
picture._alpha=9.765625
picture._alpha=19.53125
picture._alpha=29.296875
picture._alpha=39.0625
picture._alpha=48.828125
picture._alpha=58.59375
picture._alpha=68.359375
picture._alpha=78.125
picture._alpha=87.890625
picture._alpha=97.65625
picture._alpha=107.421875
picture.attachMovie('mcDef', 'mcDef'+p, this.getNextHighestDepth()); <== performing the code but no symbol shows and on list veriabls it shows there is no symbol attached!!!!!!!!!!!!!!!!!
picture._alpha=0
picture._alpha=9.765625
picture._alpha=19.53125
picture._alpha=29.296875
picture._alpha=39.0625
picture._alpha=48.828125
picture._alpha=58.59375
picture._alpha=68.359375
picture._alpha=78.125
picture._alpha=87.890625
picture._alpha=97.65625
picture._alpha=107.421875
picture.attachMovie('mcDef', 'mcDef'+p, this.getNextHighestDepth()); <== pressing the second time the symbol is attached and shows
picture._alpha=0
picture._alpha=9.765625
picture._alpha=19.53125
picture._alpha=29.296875
picture._alpha=39.0625
picture._alpha=48.828125
picture._alpha=58.59375
picture._alpha=68.359375
picture._alpha=78.125
picture._alpha=87.890625
picture._alpha=97.65625
picture._alpha=107.421875
on debugger mode it attache's the symbol to the movie on the first click!!! and no problem
why isnt it doing the attachMovie after unloadMovie??????
the unloadMove is performed right after clicking the thumbnail before sending to function that does the loadMovie or attachMovie
I tried updateAfterEvent(); after unloadMovie() and it didnt help!!
running on MX2004
10X