Hi,
thanks for your reply. I use Lucida Grande for the headers and Verdana for the text itself. The problem only occurs when using k2. All "normal" joomla text and header display all special characters.
I changed font to Arial for the header but the problem is still there.
So I don't think it's a problem of the font-settings.
I now enabled the comments so that you can have a look at. I will disable later because it looks too strange.
http://www.sandra-eversberg.de/component/k2/entscheidungen-treffenbtw: is the only option to delete ../compontent/k2/... really to buy SEF-extension?!