I did a downgrade from 4.6 to 4.4.3. Now, when I try to log in via kdm xfce starts at first but after the desktop can be seen for half a second something breaks and I am returned to the login manager. I use Gentoo and this is reproduceable here. If you need any further info please leave a comment.
If you are using kdm, then it means it should start Xfce by using a desktop entry file located at /usr/share/xsessions. It is provided with xfce-utils. You can start from a tty by executing startxfce4 yourself. See if it crashes and report back. To store a log run startxfce4 as: startxfce4 > /tmp/xsession.log 2>&1 You will have to stop kdm also. One problem that I think could fix your problem to log in is to clean up the saved session, by doing: mv ~/.cache/sessions ~/.cache/sessions.bak, while you are logged out!
It solved the problem, thank you very much. Do you think the bug report can be closed with this?
I don't see any code changes going to happen to support downgrades. You can close the bug.