[Plugin: Developer Formatter] Internet Explorer collapsing code post-load

In Internet Explorer (7 and 8) the code blocks on my site http://gameclay.com/documentation/t3d-materials show up fine during page load, but once the page has completed loading, these blocks get collapsed into a single line. I have poked a bit at the CSS, but have not had much luck in resolving this.

http://wordpress.org/extend/plugins/devformatter/