Thread:Project:Support desk/Error when trying to watch pages/reply (7)

I now have a reproducible case in which this occurs, at least on 1.19.3. I recently added the following lines to our LocalSettings.php:

$wgGroupPermissions['*'   ]['writeapi']        = false; $wgGroupPermissions['user' ]['writeapi']       = false; $wgGroupPermissions['bot' ]['writeapi']        = true;

This caused the Watch/Unwatch feature to break, as documented in the OP, though editing the raw watchlist worked fine. Reverting the changes fixed the problem. My first suspicion is that there's an incorrect permissions check somewhere in the MediaWiki software.