AfterUpload Event Not Always Firing (java)

	var iu = new ImageUploaderWriter("ImageUploader", 684, 395);
	
	iu.addParam("LicenseKey", "72XXX-XXXXX-XXXXX-XXXXX-XXX90");
	
	iu.activeXControlEnabled = false;
	iu.javaAppletEnabled = true;
	
	iu.javaAppletCached=true;
	iu.javaAppletVersion		= "5.8.1.0";
	
	iu.activeXControlCodeBase = "ImageUploader5.cab";
	iu.javaAppletCodeBase="./";
	
	iu.addParam("PaneLayout", "TwoPanes");
	iu.addParam("BackgroundColor", "#ffffff");
	iu.addParam("ButtonSendText", "Upload Selection");
	iu.addParam("RedirectUrl", "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX");
	iu.addParam("ShowDebugWindow", "true");
	iu.addParam("showNonemptyResponse","");
	iu.addParam("AllowCmykImages", "false");
	iu.addParam("CmykImagesAreNotAllowedText", "CMYK colours. Cannot use unless converted to RGB colour profile.");
	iu.addParam("FileMask", "*.jpg;*.gif;*.bmp;*.png;*.jpeg;*.jpe;*.tif");
	iu.addParam("AllowLargePreview", "true");
	iu.addParam("AllowAutoRotate", "true");
	iu.addParam("ShowContextMenu", "false");
	iu.addParam("EditDescriptionText", "Name?");

	iu.addEventListener("BeforeUpload", "ImageUploader_BeforeUpload");
	// I also have tried an AfterUpload event here, neither work in FF Mac


	function ImageUploader_BeforeUpload(){
		
		// here i loop through the selected items and get the names to pass on to the redirect url
		// sometimes on Mac FF it gets in here, but too late, other times it never gets in here at all
		// all other browsers and OS it works as expected

	}

var counter = 0;
	function ImageUploader_BeforeUpload(){
		var sURL_Query = "";
		var iuOBJ = getImageUploader("ImageUploader")
		var description = "";
		var imageindex = 1;
		if(addList_M == ""){
			for(i = 1; i <= iuOBJ.getUploadFileCount(); i++){ 
				if(("" + iuOBJ.getUploadFileDescription(i)) == ""){
					imageindex = imageindex + 1;
				}else{
					description = iuOBJ.getUploadFileDescription(i);
					imageindex = 1;
					if(description != ""){
						counter = counter + 1;
					}
					addList_M = addList_M + description + ",";
				}
				//sURL_Query = sURL_Query + "&IO_" + i + "=" + description;
				//sURL_Query = sURL_Query + "&II_" + i + "=" + imageindex;
				iuOBJ.AddField("IO_" + i,description);
				iuOBJ.AddField("II_" + i,imageindex);
			}
			if(counter == 0){
				alert("Please enter at least one name.");
				return false;
			}
		}
		iuOBJ.setAction("XXXXXXX [ I reset the action here with the list of names in addList_M ] XXXXXXXX");
		iuOBJ.setRedirectUrl(iuOBJ.getRedirectUrl() + addList_M); 
	}

<aur:Uploader ID="ImageUploader1" runat="server"
		LicenseKey="<%$ AppSettings:ImageUploaderLicenseKey %>" Width="100%" Height="500px"
		EnableDescriptionEditor="true" EnableRotation="true">
		<Converters>
			<aur:Converter Mode="*.*=Thumbnail" ThumbnailWidth="1024" ThumbnailHeight="768" ThumbnailJpegQuality="75" />
		</Converters>
        <Restrictions FileMask="*.jpg;*.jpeg;*.png;*.gif;*.bmp" />
		<UploadSettings RedirectUrl="PhotosEdit.aspx" FilesPerPackage="1" />
		<FolderPane Height="370" />
		<UploadPane ViewMode="List">
		</UploadPane>
		<PaneItem ShowFileNameInThumbnailsView="false">
		</PaneItem>
		<DetailsViewColumns InfoText="" />
	</aur:Uploader>

Protected Sub ImageUploader1_FileUploaded(ByVal sender As Object, ByVal e As FileUploadedEventArgs) Handles ImageUploader1.FileUploaded
        Dim uploadedFile As UploadedFile = e.UploadedFile
        Dim convertedFile As ConvertedFile = e.UploadedFile.ConvertedFiles(0)

        'Save file
        Dim imgStream As System.IO.Stream = convertedFile.FileStream
        Dim intDocumentLength As Integer = imgStream.Length

        Dim objP As New CComBOL.clsPhoto(LoggedOnUser)
        objP.PhotoAlbumID = GetIntFromString(Request.QueryString("photoalbumid"))
        objP.Description = uploadedFile.Description
        objP.DescriptionLong = ""
        objP.SiteLocationID = 0
        objP.UserID = LoggedOnUser.UserID
        objP.TakenBy = Request.QueryString("photographer")
        objP.Tags = ""
        Try
            objP.DateTaken = CType(Request.QueryString("datetaken"), Date)
        Catch ex As Exception
            objP.DateTaken = Main.Mindate
        End Try

        objP.FileName = convertedFile.Name
        objP.FileSize = convertedFile.Size

        ReDim objP.Photo(intDocumentLength)
        imgStream.Read(objP.Photo, 0, intDocumentLength)
        imgStream.Close()

        objP.AddNew()
    End Sub