Thomas Pellissier Tanon
2017-09-21 13:00:38 UTC
The Index: and Page: pages editing interfaces are currently broken if the "Two column edit conflict" beta feature is enabled.
So, if your editing interface for these two namespaces seems broken to you, please disable this feature (click on the "beta" link near your user name to reach the beta feature preference panel).
This problem is tracked by https://phabricator.wikimedia.org/T176393