I noticed a small bug in the email notifications control.
I go into email settings, under which the "Do not email me inbox messages" option is selected by default and the save button is disabled. I want to see which frequency options are available for emails, so I click the frequency drop down, and then decide I wanted to keep the frequency as daily (the default). I click off of the drop down to leave it as is. Although the radio button moves to "Email me my unread inbox messages", the save button remains disabled. Here is a snapshot of what I mean:
You can work around the issue by simply clicking the radio button first, or toggling to a different email frequency then back again but it seems an easy enough bug to fix that I thought I should mention it.