Last modified: 2011-09-28 19:04:11 UTC
The Collection Extension doesn't work on the upgraded projects, giving a Javascript-alert box with an error message: ERROR: Version mismatch between Javascript and PHP code. Contact admin to fix the installation of Collection extension for MediaWiki. See, for example: http://nl.wikipedia.org/wiki/Speciaal:Boek or http://meta.wikimedia.org/wiki/Special:Book. (above from [[meta:Talk:Wikimedia_maintenance_notice]]
Fixed in r98349 and wmf branch. Live on site now.