I'm having an issue with SmartCrawl (Title & Meta) and (Social) enabled. WPforo plugin (forums) is not showing the forums pages (shortcodes) and topics. When disabling Smartcrawl or just the (Title & Meta) and (Social) options, the wpForo pages works fine.
Seems there was an issue with Yoast Seo and wpForo as well:
I already granted support access if you wish to check my WPMU settings etc.