Hello - I am having exactly the same problem, also using beta - neither the LibreOffice or Word plugins are working. They appear in the add-ons dialog but not in the Preferences - Cite - WordProcessors dialog. Is my only solution still to revert to the main version? I am finding the beta REALLY useful for annotating on my iPad so would like to avoid it if possible!
@CeciliaThirlway your issue is not related to the one on this thread. Make sure you are running Zotero not from the image file, but you have dragged it into /Applications. So restart Zotero and make sure you run /Applications/Zotero.app.
Thank you for helping but I think I am running it from Applications. Just in case I just restarted it and then went to the Applications folder and opened it from there, and it has not made any difference.
If it's still not working after that, provide a Report ID.