I am currently running the 3.0.0.0 version of the dll and the issue persists. as far as I can tell 3.0.0.0 is the dll you are distributing in the latest download of ajax uploader. The only difference is in the DLL description mine is "AjaxUploader 3.0 20090925" the latest version you are distributing is "AjaxUploader 3.0 20091224". Am I correct to assume that even the the versions are exactly the same the code is in fact different?