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Have same problem.
Wordpress 5.0.4 and Xenforo 2.1.1
In logs see here:
[28-May-2019 13:46:49 UTC] PHP Notice: Undefined index: use_xenword_legacy in /home/admin/web/domain.folder/public_html/wp-content/plugins/xenword-2019.05.03/src/Core/Connector.php on line 35
I talked to several freelancers about fixing the plugin, but no one wants to do it.
Everyone says this plugin is crap.
Shame on you, LPH. You sell a plugin that does not work. You do not give technical support to your customers.