IE9 switch to preview in IE8 causes crash

Question

Test link: http://leongaban.com/_projects/defakto/CDS/

I'm having a strange issue, previously I was able to preview my site in IE9, 8 and 7 which allowed me to write specific stylesheets for each browser version.

This morning however, when I use IE's webdeveloper tool(F12) switch to IE8 or 7 the browser just hangs, with a generic error message "mysite is not responding". IE9 everything is fine.

Not sure what's going on, I disabled my IE8 stylesheet and even commented out my javascript file, still same issue.

IE9 version: 9.0.8112.16421

I'm also using Bootstrap 2.3.1

Anyone experience this before?

Answer 1

I found out what the issue was, I was using css3-mediaqueries.js to support media queries for IE8 and below, I switched to respond.min.js and removed the old js and everything works now!

Respond.js https://github.com/scottjehl/Respond