@Andrew - so, after some debugging version 2.0.5 is NOT 'breaking jQuery', for me. But it is throwing a JS exception: Uncaught SyntaxError: Unexpected token ILLEGAL
What it is doing is stripping out the backslash from '<\/script>' tag, that lots of people have as part of their footer from html5-boilerplate.
I tested version 2.0.4 and diff'ed the rendered output with version 2.0.5, and the only difference is stripping the backslash. I have NO idea why this would be happening.
This is the entire line straight from html5-boilerplate (to load as a fallback if google fails):
<script>window.jQuery || document.write('<script src="js/vendor/jquery-1.8.1.min.js"><\/script>')</script>
Hope this helps.