Internet Explorer display problem

I don't know why, but IE is not displaying my products list for a certain category. It showed up before, but now it doesn't. It works w/other browsers, but not IE. Other categories are unaffected. What caused it & how do i fix it? My OC version is 1.4.9.5. The link is http://www.sassypantsdiaperdesigns.com/ ... es_Neutral to see what I'm talking about.

It says category not found in firefox..

You put the SEO URL in wrong. You have it Diaper_Cake_Neutral (singular).