I'm not sure how tied together html5shiv and Modernizr releases are, but there's a fairly critical bug in html5shiv 3.4 (included in Modernizr 2.5.3):
aFarkas/html5shiv#54
I ran into it via using .show() on
tags in jQuery and having them display:inline rather than the expected display:block.
I realize this would likely happen in "due course," but I wanted to highlight it in case the next Modernizr came out before the next html5shiv.
Thanks.