zotero experienced an error updating your document

I'm running zotero 2.07b2 on Mac Office 2008 with Firefox 3.5. I downloaded all of the latest plug-ins. It has been working great until today. Now, every time I attempt to insert a reference, I get the following message:

zotero experienced an error updating your document. AttributeError: 'keyword' object has no attribute 'startswith'

I deleted my python extension then reinstalled it. I also tried deleting the zotero bookmark in word- another fix that's been mentioned here- but there wasn't anything there to delete. I also pasted my document into a blank document but got the same problem. Any suggestions?
Thx. Ben

1392641966

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