global site tags widget not showing lists to posts


The global site tags widget on the front page of is displaying ok, but when you click on a tag it does not then show the list of posts.

I have tried:
- removing and re-adding the widget
- disabling/re-enabling the plugin
- deleting/re-uploading the plugin
- rebuilding the post index in the post-indexer settings.
- changing perma-link structure (bit of a punt)

I am running the latest version -