Comment 8 for bug 1271138

I've found that this bug has regressed and returned on the production version of Trusty Tahr. All three of my rigs (two upgraded and one fresh install) are affected.

The bug affects nm-applet and nautilus-dropbox for me.

For nm-applet, the fix involves editing /etc/xdg/autostart/nm-applet.desktop and changing

exec=nm-applet
to
exec=dbus-launch nm-applet

as per suggestion in http://askubuntu.com/questions/449658/networkmanager-tray-nm-applet-is-gone-after-upgrade-to-14-04-trusty

For dropbox, I taken what was mentioned in the article and changed the dropbox entry in Settings Manager -> Session and Startup -> Application Autostart -> Dropbox from

Command: dropbox start -i
to
Command: dbus-launch dropbox start -i

It appears that with 14.04, dbus-aware programs must be started with dbus-launch instead of directly.