The latest update seems to have broken my http://blog/author/username page. I get the following error:
Fatal error: Call to undefined function get_avatar_url() in /wp-content/plugins/jetpack/functions.opengraph.php on line 104
I disabled avatars as a workaround but still get the error. Just to be sure it was the plugin, I disabled Jetpack temporarily, and the problem did go away.
Thanks in advance for your help!