Thanks for your answer; but how can this be Word realated? I’m only speaking of editing my reference in title in Endnote. Word is not even running in background.
This mode change from plain text to a weblink is something Endnote does while I create a new reference entry in my Endnote library. Just by typing http://w… in any empty field (title, year, author etc.) it switches to weblink mode. I can mark these links and switch them to bold, italic and underlined format but either way they won’t turn back to plain text.