Maybe you should place a 'specific' allow and see if that will help. Try adding this:

User-Agent: Googlebot
Allow: /

Also, you still have not said if you have Google SiteMaps installed. Do you? If not, I would add it as it is the BEST way to get the attention of Google and get them to your site. Using the site map, as soon as you update your site you can just update the sitemap with the click of a button in your admin, then ping their server, and it's done. Might be better than getting too caughtup with the robots.txt? I am telling you, the sitemap mod is the best way to go.

One other thing, I use Firefox as a browser and your site comes up with the center page off to the right overlapping all the right boxes.

Hope that helps!