I am using Uploadify to enable my users to upload images via my web application.

The problem I am having is that every now and then (at what appears to be random) when the progress bar reaches 100% it 'hangs' and does nothing.

I was wondering if any developers familiar with uploadify may have any idea how to solve this? I am in desperate need of some help.

Here is my front-end code:
Code JavaScript:
 
jQuery(document).ready(function() {
 jQuery("#uploadify").uploadify({
  'uploader'       : 'javascripts/uploadify.swf',
  'script'         : 'upload-file2.php',
  'cancelImg'      : 'css/images/cancel.png',
  'folder'         : 'uploads/personal_images/' + profileOwner,
  'queueID'        : 'fileQueue',
  'auto'           : true,
  'multi'          : true,
  'fileDesc'       : 'Image files',
     'fileExt'        : '*.jpg;*.jpeg;*.gif;*.png',
  'sizeLimit'      : '2097152',
  'onComplete': function(event, queueID, fileObj, response, data)
  {
   processPersonalImage(fileObj.name);
   arrImgNames.push(fileObj.name);
   showUploadedImages(true);
   document.getElementById("photos").style.backgroundImage = "url('css/images/minicam.png')";
  },
  'onAllComplete'  : function()
  {
     completionMessage(arrFailedNames);
     document.getElementById("displayImageButton").style.display = "inline";
     document.getElementById("photos").style.backgroundImage = "url('css/images/minicam.png')";
  },
  'onCancel'  : function()
  {
     arrImgNames.push(fileObj.name);
     arrFailedNames.push(fileObj.name);
     showUploadedImages(false);
  },
  'onError'  : function()
  {
     arrImgNames.push(fileObj.name);
     arrFailedNames.push(fileObj.name);
     showUploadedImages(false);
  }
 });
});

And server side:
Code PHP:
 if (!empty($_FILES)) 
 {
  //Get user ID from the file path for use later..
  $userID = getIdFromFilePath($_REQUEST['folder'], 3); 
  $row = mysql_fetch_assoc(getRecentAlbum($userID, "photo_album_personal"));
  $subFolderName = $row['pk'];
     //Prepare target path / file..
  $tempFile = $_FILES['Filedata']['tmp_name'];
  $targetPath = $_SERVER['DOCUMENT_ROOT'] . $_REQUEST['folder'] . '/'.$subFolderName.'/';
  $targetFile =  str_replace('//','/',$targetPath) . $_FILES['Filedata']['name'];
  //Move uploaded file from temp directory to new folder
  move_uploaded_file($tempFile,$targetFile);
  //Now add a record to DB to reflect this personal image..
  if(file_exists($targetFile))
  {
   //add photo record to DB
   $directFilePath = $_REQUEST['folder'] . '/'.$subFolderName.'/' . $_FILES['Filedata']['name'];
   addPersonalPhotoRecordToDb($directFilePath, $row['pk']);
  }
  echo "1";
  die(true);
 }

thanks for any help!!