After nodewords installation, there were no ‘Meta’ tags available in the Meta tag selection form (in the nodewords settings page). Enabling or disabling made no effect. Also no tags were shown in the HTML output. The ‘Global meta tags’ page told, ‘no metatags are selected in the settings page’.
Googling revealed that the scenario also happens if we upgrade to the same version.
The solution is to clear the cache. Go to
/admin/settings/performance and at the bottom click ‘clear cached data’.