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a4j.AJAX is null or not an object in Visualforce page

One of my users is getting an error when clicking on a button that uses an action and rerenders.  I assume this is something on his client browser.   Has anyone seen this error before?


a4j.AJAX is null or not an object


He is using IE

Ron HessRon Hess
Which version of IE ?

One of my customers was getting this on IE 6.  The following sorted it:


 'This problem/error is caused by an Internet Explorer 6 Security Setting.   If you go to Tools->Internet Options->Security Tab.  Click ‘Custom’ and OK any message.  Then scroll down to ‘Script Active X Controls ….’.  This should be enabled.'