I am not able to generate a valid sitemap. It runs just fine, and generates the urls accordingly. When it is finished, I can see the sitemap preview from the "view sitemap" tab. But when I download the file and view it (or if I validate it,) it is a garbled mess and will not validate.
I have tried using utf-8 settings both on and off, and I get the same results.
I think the problems are ä ö ü ß.