WordPress Membership Plugin
The problem is that neither I nor a user can change the email at all directly in your plugin. That field is just a text string and not a text box when going to the profile page (…/membership-login/membership-profile/). The only work around I have found is to show the wp-admin bar or create a direct link to the profile-page in wp-admin. I was expecting it to be possible to change the email in the same way as all the other fields are available for editing in…/membership-login/membership-profile/. It is a bit confusing for users not familiar with WP to suddenly come to something that looks completely different than the rest of the site if the wp-admin profile page should be used for updating the email.