I've noticed when using 1S there is no icon in the system tray when using the Unity desktop. There is a icon in the system tray when using Gnome 3 or Xfce desktops but not on Unity.
Ubuntu Unity no 1s icon in the system tray.(3 posts) (2 voices)
I can confirm this. It appears to be a problem with the default config on unity--only whitelisted applications may have systray icons.
run dconf-editor (install the package 'dconf-tools' if you don't have it)
Browse to >desktop>unity>panel
edit the 'systray-whitelist' entry from:
['JavaEmbeddedFrame', 'Wine', 'scp-dbus-service', 'Update-notifier']
['JavaEmbeddedFrame', 'Wine', 'scp-dbus-service', 'Update-notifier', 'OneSwarm']
Hit enter, exit program, log out/back in, and it that at least gets it working on this end.
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