Code appearing when inserting a citation

Hello, I am trying to support a student who has downloaded the most recent version of Zotero for Firefox. She has a mac on Yosemite 10.10 and is running the most updated version of Firefox: 41.0.1. The Zotero download is 4.0.28.7 (which, I think, is the most recent).

When she inserts a citation this is what she sees: https://goo.gl/tbZ1NY
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