Closed Unassigned: AjaxFileUpload [27407]

After upgrade to april release, AjaxFileUpload doesnt' work anymore.
Browser reports a 404 error looking for "AjaxFileUploadHandler.axd?contextKey={...." loading page containing control, and a 500 error posting data to server.

Comments: Merged with [27806](https://ajaxcontroltoolkit.codeplex.com/workitem/27806)