We've deployed a new Joomla 3.6.5 site, and everything is going wonderfully, except that we've just noticed that all the Article tabs (except the JCE content editor) do not appear in \Administrator.
In the test site, this is not occurring, and from the front end, all except Options/Permissions appear.
I've checked all the ACL/Permissions, there are not JS errors, and all the JS/CSS inclusions are loaded. I can't imagine what other factors might come into play or where to debug this. Any ideas why this is occurring?