Zotero Buttons do not work

I'm LibreOffice 3.6. and Ubuntu 12.10, Zotero 3.0.11 and Zotero Libre Office 3.5.3. If I try to install it on LibreOffice it tells me that it didn't work. I have however the Zotero buttons in LibreOffice (text no icons) but they do not work.
Thanks in advance
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