zotero crashes when I try to merge citations

I have Firefox 17.0.6 esr, Libre Office and Zotero 4.0.8 on linux. I installed yesterday. When I try to remove duplicate citations, zotero crashes and asks me to send an error message. After the first time the interface looks different. The merge stuff is missing.

Here is a screenshot www.stam.com.au/zotero.jpeg

When I click on the bar just above "Choose the version of the item..." it crashes.

The first time it happened, I removed zotero for both Firefox and Libre Office and reinstalled. The merge stuff was still missing but everything else seems to work.

Any clues how to fix this?
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