I know a few people are getting logged out too quickly. I don't have the answer to that yet.
However, one change that occurred is that there is no longer a log in name and a separate display name. The upgrade discarded the log in name and now uses the display name. So, to log in:
Username: <display name>
Password: <your password>
If you need to contact me to find out what your display name is use: Contact Us and we can get things sorted out.