New LXSession autostart problem: 2 instances of nm-applet

[John Hupp]

When understanding broke upon me today concerning LXSession's default 
setting (in 13.10) of 'disable_autostart=config-only' (rather than 
'disable_autostart=no'),  I changed it to NO and immediately solved a 
weeks-old problem with SpiderOak Backup not auto-starting.

But this change triggered a new problem: There are two instances of 
nm-applet running.  Both instances work and yield the same information.

Since I had set disable_autostart=no in both 
/etc/xdg/lxsession/Lubuntu/desktop.conf and in 
~/.config/lxsession/Lubuntu/desktop.conf, I considered it possible 
(though unexpected) that this was causing two instances to autostart, 
but setting disable_autostart=config-only once again in 
/etc/xdg/lxsession/Lubuntu/desktop.conf did not solve the problem.

The obvious questions: What happened?  How can I fix it?