Hi everyone,
We have some general Javascript errors that we've been discussing here: https://bugzilla.wikimedia.org/show_bug.cgi?id=34450
Yesterday, Roan and others made some fixes in this area in an attempt to address the problems we were seeing. Here's a list of Roan's commits: https://www.mediawiki.org/wiki/Special:Code/MediaWiki/author/catrope
In an effort to fix things, he enabled $wgResourceLoaderExperimentalAsyncLoading for logged-in users our 1.19 wikis. meta.wikimedia.org is where we've seen the most problems, so that would be the best place to test.
Could anyone who has time please spend some time hammering meta.wikimedia.org, looking out for the problems described in 34450 in particular? Please report issues either there, or if that's getting too spammy, let's overflow here: https://meta.wikimedia.org/wiki/Talk:Wikimedia_maintenance_notice
Thanks Rob