I experienced an issue similar to this several months ago. I was using a plugin to kill query strings from the URL for SEO purposes. Long story short the plugin was killing search pages and admin pages as well.
As Chris_O mentioned the redirection plugin I encountered a similar redirection issue when track modify posts is enabled.
The plugin is smart enough to realize when you edit a post or page and will set up a redirect if the post or page’s permalink has changed. However, when creating a new page this feature will create a redirect back to the root because the page has never existed before. More found here (http://www.blakeimeson.com/wordpress-redirection-plugin-home-page-redirect-problem-bug/ and http://tulsawebresults.com/solution-wordpress-redirection-plugin-error ).
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