No systray icons (11.04)

Possibly some packages is missing, but I cannot figure out which ones...

I have the same setup 'all' and 64bit, vlc and others display, even gnome-volume-applet.
Is systray 'always' in pidgin preferences -> interface enabled? It can also be started by click on the small envelope.
Did you setup with dconf-editor?
Maybe logout-in helps.

Indicators installed here:
dpkg -l indicator* |grep ii

ii indicator-applet GNOME panel indicator applet
ii indicator-applet-appmenu Clone of the GNOME panel indicator applet
ii indicator-applet-complete Clone of the GNOME panel indicator applet
ii indicator-applet-session Clone of the GNOME panel indicator applet
ii indicator-application Application Indicators
ii indicator-appmenu Indicator for application menus.
ii indicator-datetime A very, very simple clock
ii indicator-me indicator showing user information and status
ii indicator-messages indicator that collects messages that need a response
ii indicator-session An indicator showing session management, status and user switching.
ii indicator-sound A system sound indicator.
ii indicator-weather indicator that displays weather information

Just in case have a look through topics there.
http://askubuntu.com/questions/tagged/indicator+unity

@Sam - have the same installed indicators, plus network one.
My guess that system tray is operated by something else (or may be by configuration parameter of Unity).
['all'] was set up both by dconf-editor and console command, multiple times logged out and rebooted.

Thanks for the link, I'll look through it soon :)

> system tray is operated by something else

Something else is 'indicator-appmenu'.
https://wiki.ubuntu.com/DesktopExperienceTeam/ApplicationIndicators

If apps don't integrate the code to display in appmenu they won't display, but obviously VLC, Skype and Pidgin do.
https://wiki.ubuntu.com/DesktopExperienceTeam/ApplicationIndicators#Priority%20Applications

Except weather indicator I didn't install anything else related to appmenu. Maybe it's different theme setup or multi monitors.
https://launchpad.net/ubuntu/+source/indicator-appmenu/+bugs