UPLOAD_COMPLETE_DATA - return size limit?

[gooneybird]

I'm doing an image upload that returns a large chunk of data - I'm base64-encoding the uploaded image and returning it immediately within an XML document. This data is retrieved via the UPLOAD_COMPLETE_DATA handler.

On my Windows machine, the data comes back perfectly. On my Mac, however, only a small piece is returned. If the file that I upload is more than a few kilobytes in size, only a truncated version of the data is returned (exactly 2,634 bytes each time). This leads me to believe that there is a limit (at least on the Mac version of the Flash player) to the amount of data that can be returned this way. Anyone else experienced this issue?

And yes, I've tested the backend thoroughly, the entire image is being uploaded correctly - I can save it to the server, I've even created text files of the output on the server just to make sure the right info is being sent back.

I've completely simplified my code for testing. There are two buttons (browse and upload) and a textarea to view the output.

var fr:FileReference = new FileReference();

browse_btn.addEventListener(MouseEvent.CLICK,doBrowse);
upload_btn.addEventListener(MouseEvent.CLICK,doUpload);

function doBrowse(e:Event):void{  fr.browse();  }

function doUpload(e:Event):void
{
 var URLreq:URLRequest = new URLRequest("scriptnamehere.php");
 fr.addEventListener(DataEvent.UPLOAD_COMPLETE_DATA,uploadSuccess);
 fr.upload(URLreq);
}

function uploadSuccess(e:DataEvent):void{  
 debug_textarea.text += e.data;
} 

Any feedback would be appreciated.