Is this robots.txt making Google not to show some of my content?

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If you changed your site path, the urls previously indexed by search engines are no longer valid.

Google Webmaster Tools has a change of address tool: http://support.google.com/webmasters/bin/answer.py?hl=en&answer=83106

In general, you need to :

  1. setup 301 redirects for your old urls

  2. create a new sitemap

  3. be patient