It stopped working recently and I'm not sure why (ASP .NET MVC 4, jQuery 1.8.3). All things using unobtrusive ajax on my site (validation, Html.Ajax, Ajax.ActionLink, etc) simply do a regular post instead of an AJAX post.
My only clue is
Uncaught SyntaxError: Unexpected token ILLEGAL jquery.unobtrusive-ajax.js:96
In the Chrome debugger.
I've tried updating the nuget package.
How can I troubleshoot further or at least get some useful clues?