View PDF does nothing in Zotero 2.1.8

I'm using Zotero 2.1.8 with Firefox 5.0 on Kubuntu 11.04. I have created links to filesystem pdfs for article items in my library. When I secondary-click and select "View PDF", nothing happens. Same thing with double-clicking.

Firefox is configured to always open pdfs with Okular 0.12.2. When I follow links to pdfs from web pages, they open in Okular as expected.

Any ideas?
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