I updated to the latest version of AjaxControlToolkit, but it still does not work. For example, UpdatePanel works for the first time, but never hits my endrequest handler.
I had a similar problem. I replaced the scriptManager elements in the ToolKitScriptManager page and got the job done. ToolkitScriptManager can be found in ajax dll. If you have not imported ajax dll yet, there is a step-by-step explanation here http://dotnetguts.blogspot.com/2008/06/ajax-control-toolkit-vsnet-2008.html
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