I'm having an issue in ie7 where my stylesheet isn't loading at all, I've checked that it's encoded as utf-8 without BOM and the charset on the page is set as utf-8. Here's the head:
<!DOCTYPE html>
<!--[if lt IE 7]> <html class="no-js lt-ie9 lt-ie8 lt-ie7"> <![endif]-->
<!--[if IE 7]> <html class="no-js lt-ie9 lt-ie8"> <![endif]-->
<!--[if IE 8]> <html class="no-js lt-ie9"> <![endif]-->
<!--[if gt IE 8]><!--> <html class="no-js"> <!--<![endif]-->
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title></title>
<meta name="description" content="">
<meta name="viewport" content="width=device-width">
<link rel="stylesheet" href="public/themes/dark/less/style.css">
<script src="js/vendor/modernizr-2.6.2.min.js"></script>
</head>
And here's the site if it's any help: http://www.mattjonesmusic.com/
I think this bug likely occurs on ie6 as well although I don't have a vm setup to test it.
Found the answer, it was a compilation issue (I'm compiling bootstrap myself from source). I'd got rid of an include defining a variable that was used only in ie filters.
Thanks to all that tried to help.