Submitting an XML Sitemap to Google

Hi. I just purchased Clickbump's wonderful Wordpress theme called ClickBump Engine version 3, and I would just email Scott and ask him this, but I have been asking him a lot of questions in the past few days, and he has been so great with his product support, but I would like to stop bothering him if possible. LOL So I thought I would try to get my question answered here first. I was reading some posts here on Warrior Forum about how to get your site indexed and one of the suggestions I read was to submit an XML sitemap to Google. So I installed the XML-Sitemap plug in for Wordpress and generated my sitemap, submitted it to Google's webmaster tools and everything seemed to be alright. There was a big green check next to my submitted sitemap. That was yesterday....this morning, when I checked back in to make sure it was still working alright, there was a big red X next to my sitemap submission. I clicked on the tab called 'crawler access' and saw the following:

User-agent: *
Disallow:

Sitemap: http://mysite.com/sitemap.xml.gz

I am totally illiterate when it comes to all this. Does anyone here use the Clickbump theme, or Wordpress for that matter, who could shed some light on this for me.

Also, one more Q, the theme includes an option that generate a sitemap for my site (one for my visitors to see). Is this the same thing as an XML sitemap? Do I need to submit both to Google?
And is the submitted sitemap something I need to maintain over at Webmaster Tools, or is this something I do once for my site, and then forget about?

Thanks in advance.
April