Our application is running in many shared hosting environments on regular Windows servers. So no load balancing, no web farm, no cloud environment or whatsoever. But as I said in a previous post: the #2038 issue is reproducable in the Ajax Uploader demo page at http://ajaxuploader.com/Demo/multiple-files-upload.aspx.
Just try uploading a file of eg. 6 Mb using Safari on Mac.
So I don't think you need me to upload a test page somewhere?
Regards, Marja