Thread:Project:Support desk/Missing Namespace Tab Labels in Vector

The Vector skin typically has two namespace tabs in the upper left corner of the content area. By default they're "Page" and "Discussion". I'm setting up a wiki as a player resource for an online game, but I also have a second wiki setup for game staffers. They were both running 1.16, and I updated them both to 1.17. I realized that some of my extensions weren't going to work properly yet, so I rolled back to 1.16.5 in the mean time, and everything seems to work. In the process though, I'm somehow lost those Namespace tab labels on one wiki, but not on the other. I'm trying to figure out how this happened when I followed the same process with both.

The two installs have nearly identical LocalSettings.php files. The only differences are things like site name, SQL login creds (they share a table with different prefixes, but I use two different logins), and script path/article path. The only other difference is to restrict editing. The player wiki has:

$wgGroupPermissions['*']['edit'] = false;

$wgShowIPinHeader = false;

$wgGroupPermissions['*']['createpage'] = false;

while the staff wiki has:

$wgGroupPermissions['*']['read'] = false;

$wgShowIPinHeader = false;

$wgGroupPermissions['*']['createpage'] = false;

$wgWhitelistRead = array("Special:Userlogin", "MediaWiki:Common.css",

"MediaWiki:Common.js", "MediaWiki:Monobook.css", "MediaWiki:Monobook.js",

"MediaWiki:Vector.css", "MediaWiki:Vector.js", "-");

$wgGroupPermissions['*']['edit'] = false;

$wgGroupPermissions['*']['createaccount'] = false;

I even tried deleting everything in the affected wiki's directory except for images, extensions, and LocalSettings.php, and then unpacking the tar.gz again and running the update script, and the problem persists. Is it something in the DB? Help me get my namespace labels back!