I was looking ahead for the ESS manual but did not find. I did not know the URL of the feed. Then I discovered it but feed was blank (nothing in it). I have found that it is due to NextGEN Gallery plugin. When I disable NextGEN everything works when I turn it on feed is empty. After ugrade NextGen to 2.0.33 nothing happens (same issue, empty feed). I have WordPress 3.6.1. CZ. I can not upgrade to version 3.7, because it is not yet in the cz version (only us_en), and my client requires cz version. I need both plugins (ESS export and NextGen).