Visual CSL Editor doesn´t save changes

Hi all, I tried to edit an existing citation style and in the preview of the CSL Editor the result is like I want the style to look like. I followed the steps named in "getting started with the Visual CSL Editor" for saving my new style. I also found it when I wanted to cite while writing using the word plug in, but it is like I never changed it. My changes are lost. Any ideas? Best, Ilona