The setting appears under Settings > Miscellaneous. It's the second setting, the one before it is "Usergroup for Wiki Moderators".
This is the full text of the setting if you need to search for it:
"Allow Wiki Content Integration
Wiki content can be placed in headers on other pages than where the original content was posted. This applies site-wide in both wiki and non-wiki areas of the site. It can be fine-tuned using other settings. Note that this will add at least 1 query on every page where wiki integration is permitted."
I just confirmed that the phrases for this setting are in fact missing on new vBulletin-based installations. You can force a value by modifying
vault/core/model/settings/vb3.php. Find:
Code:
protected $store = array();
Add after:
Code:
public function __construct() { $this->set('vw_integrate', true); }
@Alfa1, please request that we change the global Yes/No to checkboxes that automatically have available content-types as choices.