If you’re like us you use the Yoast SEO plugin on all of your sites. In the Yoast SEO 7.0.1 update our clients realized the update button was gone from all categories.
You may have even seen an error like:
Fatal error: Uncaught TypeError: Argument 1 passed to WPSEO_Metabox_Tab_Section::add_tab() must implement interface WPSEO_Metabox_Tab, boolean given
The fix until they release a patch is quite simple.
Just do the following:
In the Yoast SEO settings go under “Social” and either Facebook or Twitter is disabled. If you enable both of those then the update button will show back up.