Posts don’t load in Firefox, Camino, Opera and Flock

If I go to https://www.juanamartinezneal.com/blog/ the page shows. Once I select a post, I have an endless loading blank page. That happens in the following browsers:
MAC: Camino 2.0.2, Firefox 3.6.
PC: Opera 10.10, Flock 2.0.3, Firefox 3.0.7
Posts load with no problem with:
MAC: Safari 4.0.4, Chrome 5.0.307.11
PC: Safari 4.0.3, Chrome 4.0.249.89, EI7, AOL Explorer 1.5

My setup:
Website: https://www.juanamartinezneal.com
Hosting: Godaddy Linux, php 5.x – I upgraded to 5x today.
Feed: https://juanamartinezneal.com/feed/ – validated.
Feed is redirected via htaccess with feedsmith.feedburner.
WP: 2.9.2
Plugins Active: Hello Dolly, Subscribe to Comments, WP-Spam Free
Plugins Inactive: Akismet, Official Stat-counter Plugin

I’m pretty knowledgeable with css/xhtml so don’t be afraid to get techie. I haven’t had much luck with answers.

Thanks you,

Juana