Interesting, I founded similar issue due to a "console.log();" instruction. the issue is that console.log not exists if you havent pressed F12 (LOL). For me the issue is IE9 =).
IE does not show any javascript error if you work without F12?
Thank you for your reply!!! In one of my scripts I was logging to the console. But I didn’t check wether or not the console was enabled in the browser. So, on IE it gave a error.