There seem to be a few possible causes that make metacity not to start
after login. I experienced this problem after upgraded Ubuntu Netbook
Remix 9.10 to UNE 10.04 final and cleaned out some stale packages.

To find out what happened, you can turn on the debug mode for gnome-session by 
modifying the line
    exec $STARTUP
in /etc/X11/Xsession.d/99x11-common_start to
    exec $STARTUP --debug
Then logout and login again, and search the file ~/.xsession-errors for 'Phase 
WINDOW_MANAGER'. Read the lines below it to see what happened when 
gnome-session tried to start metacity. It may also be useful to search for 
'metacity' in that file.

In my case, I found a line stating
    app /org/gnome/SessionManager/App29 is disabled by Hidden
It turned out the /org/gnome/SessionManager/App29 was actually read from 
/home/<user>/.local/share/applications/metacity.desktop, and in that file there 
existed a line
    Hidden=true

Since there is a system-wide metacity.desktop located in
/usr/share/applications, I simply deleted the one in
~/.local/share/applications so that gnome-session can read it instead.
Logout and login again. Metacity started up nicely without any problem.

Don't forget to remove the --debug parameter after you are done with
debugging.

-- 
metacity in not starting on login
https://bugs.launchpad.net/bugs/550082
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