Firefox weirdness over at "WizCast"

I’m using an “adopted” template for the WizCast page, and for some reason or another I’m seeing a big, long gap between the first post and the subsequent ones in Firefox. (Not in Netscape, though, and not in IE6.) It occurs to me that something may be wrong with the CSS, or the Blogger tags. My apologies to other Firefox users who’re seeing this. (Assuming that you are…) I’m trying to fix it (along with six million other things), but it may take a while to sort out…