Upgrading to the latest versions of Zotero and Word plugin broke Word integration.
The reason: I use a non-English version of Word and the installer seems to think that I’m on an English version. (Duh, all that technological imperialism …)
The solution:
look for the folder /username/Dokument/Microsoft användardata/Word script menu items/Zotero (or the equivalent to these Swedish folder names in your local language); this is the place the Word plugin need to be placed for it to work.
Also, find the folder /username/Dokument/Microsoft User Data/Word Script menu items/Zotero. This is the place where the installer, assuming that we are on English installs, has placed the 3.0a5 plugin.
Move the stuff in the Zotero subfolder to the Zotero subfolder in …/Microsoft användardata/…
It works!
I’m on Word2008 (Swedish), Mac 10.5.6, Firefox 3.5.3.