Wrong thread 🙁 sigh. Had two open.
Just to add to the mix, some pages still show the custom one, but dont indicate it in the admin interface, and for some reason also stop working at times too.
I’m actually still seeing this (hosted WP) – Any luck WPMU? Any suggestions … can’t really turn Jetpack off ;/
https://dl.dropboxusercontent.com/u/118962/WordPress/doesnt-save-setting.gif
