I may be misremembering the file size (8kb? 32kb?), but I distinctly remember this being the bane of my existence for IE6.

EDIT: my memory was faulty—I was conflating two bugs:

1. Certain CSS expressions on html or body tags could cause pages in IE6 and 7 to crash

2. In IE6, the browser would happily parse large CSS files until ~288kb of CSS had been parsed and applied. Any remaining CSS would be silently ignored and discarded. See: http://joshua.perina.com/africa/gambia/fajara/post/internet-...

This sounds a lot more familiar! Good find.