Hi,
1. Any time you are signed in as a user and you change the user email (or username if not using email for login), you must log out and log in again after making such a change so the cookie can be set with the new email or user name.
2. I do not experience this issue in any of my mojoportal installations. It could be a browser caching issue or a proxy server or other things. I would try different browsers and different client machines and seee if it is the same.
Obviously since you are using a version that has not been released yet, you must be making your own custom build. Perhaps you have changed something in the code or made a packaging error.
So this is not really a bug in mojoPortal released versions nor in my local version of the latest code.
Hope it helps,
Joe