Romanian characters on Mac Leopard disappeared

Hi,
I have Mac OS Leopard.
I've installed Zotero on Firefox (locale = romanian) and it has worked 2 days. After that the romanian characters have been replaced by strange characters. The characters in Firefox work normally, but not in Zotero.
I've reinstalled Zotero, without succes.
Have anyone this problem?
Use Zotero and Firefox different fonts?
Thank you,
Nicolae

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