We are using the ASP.NET Web Optimization Framework with bundles and minification. One bundle just contains jquery and modernizr. This all worked fine with jquery 1.8.3 but
I was unable to reply to awj's answer, above, so I just voted it up. Fantastic piece of detective work. I wanted to add on to a comment, that while the problem was indeed fixed in jquery 1.9.1 it now shows up in the jquery-migrate-1.1.0
I noticed the map file reference as only a single-line comment at the end of the "jquery-migrate-1.1.0.min.js" file. So following awj's suggestion I made it a multi-line comment.
So line 3:
//@ sourceMappingURL=dist/jquery-migrate.min.map
now becomes lines 3, 4, and 5 as follows:
/*
//@ sourceMappingURL=dist/jquery-migrate.min.map
*/
Once I uploaded back to my ISP I have full ajax functionality again.
Thank you again AWJ, this has helped out greatly!