Word Plugin Incompatible

I've just upgraded to Sync Preview 1.5, and upgraded the Word plugin, but I'm getting the error:

"This version of the Zotero Word plugin (1.0b4) is incompatible with the currently installed version of the Zoteron Firefox extension (1.5-sync3.1). Please ensure you are using the latest versions of both components"

As far as I can tell, I am using the latest versions. Does anyone have any suggestions?

Cheers
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