Endnote X7 export to Bibtex

I converted the endnote library to bibtex several years ago. It's totally behind my mind already. Today I want to try the endnote X7 and to see whether something improved in this new version endnote. It is rather good to involve the bibtex template into its export style options. However, I found that there is no citation key for each reference at all. According to the search, the endnote needs the label of a reference as its citation key. But it seems that it doesn't work quite smoothly.  Therefore, I downloaded a Bibtex Export from endnote's style manager on its site and restart the whole endnote. I am not quite sure if the restart works or the new export style works. Finally, I got it work with reference label to be its citation key.