Problems with german "Umlaut" when using look up with isbn

Hello,

i use the last version of zotero. I've a problem with german umlaut. If I catch a book by using lookup (usually the isbn number) and the title or another field has a german "umlaut" then the german "umlaut" is not right encoded.

Example:
Place: Mu¨nchen instead of München

In Firefox 3 with Zotero 2.1 it seems that the field contains München - but that is not true, it is Mu¨nchen.
Firefox 4.0.1 with Zotero 2.1 shows the two points with belongs to the u above the n.

But in both cases - Firefox 3 or Firefox 4 - i can not search for field entry. If I use the search field it does not shown a result - whether I use München to search or Mu¨nchen.

How can I solve this problem?

Greetings, Maria!

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