I've upgraded from version 1.3.6 to 1.4.1 using pip on Ubuntu 10.04. All went fine without errors. After starting up I see all repository groups including their repositories and change logs and all things.
If I'm logged in as admin user and go to settings the list of repositories and the list of users is empty. The list of repository groups and user groups is filled. Also adding a new repository doesn't list this repository (URL: /_admin/repos).
Scanning for new repositories says "added , removed ". If I delete some repositories on disk, they appear after "removed".