Zonx, i had the same problems with the "Umlaute". I think the problem is with your FontArial14T.xml_File.
In your _FetishStyles.xml-File i changed the line
PHP Code:
<include>FontArial14T.xml</include>
into
PHP Code:
<TextStyle Algorithm="Simple" FontName="Arial" Language="english" Leading="-2" Name="FontArial14T" PointSize="13" UseCachedFont="true"/>
and the "Umlaute" are shown correctly.
It's line 259 in the _FetishStyles.xml-File. Should be a quick fix for other germans.