problem with spellchecking german documents

[Rick Janda]

I tried to spellcheck a german document. The documentlanguage is set
to german and everything works fine, except spellchecking.

The spellchecker stop at every word which contain german umlauts
(ü,ä,ö,Ü,Ä,Ö) or a sharp s (ß). If I try "Insert in personal
dictionary" or "Insert in personal dictionary" I will get "Word
'Universitäten' contains illegal characters."

Can anybody help me with this problem?

Thank you, Rick