I am for the moment just including jQuery (1.9.1, but old 1.8.3 behaved the same way) in my ASP.net webpage (Site.Master file actually). Everything worked fine running unde
the jQuery team uses exceptions in certain situations for logic flow. See this bug I filed for the same problem with WinJS apps: http://bugs.jquery.com/ticket/14123
since the exception's handled, they don't consider it a problem. I do, since it makes debugging the app way harder without "break on throw" set.
So, that's the problem. Nothing you can do about it.