AjaxFileUpload Not firing the OnUploadComplete on the Webserver

I've got a AjaxFileUpload that triggers code OnUploadComplete. It works fine at the localhost level, but when I build it to the Development webserver, the OnUploadComplete doesn't fire. I know this because I set a label to give me information when the OnUploadComplete fires. It is also suppose to update a sql table with information when the upload is complete.

Why won't it trigger on the webserver?

<ajaxToolkit:AjaxFileUpload ID="AjaxFileUpload1" runat="server" OnUploadComplete="AjaxFileUpload1_UploadComplete" AllowedFileTypes="doc,docx,xls,xlsx,xlsm,jpg,png,gif,pdf"
Enabled="False" />