The culprit is revision 4187 
(http://bazaar.launchpad.net/~unity-team/unity/trunk/revision/4187): in 
lockscreen::Controller a new menu::Manager instance is created to handle the 
lockscreen indicators, then as soon the new LockScreenDBusIndicators instance 
connects to the new com.canonical.Unity.Panel.Service.LockScreen bus it calls 
DBusIndicators::Impl::OnIconsPathChanged, which asks the lockscreen panel 
service for icon paths, but the *lockscreen* panel service is just started and 
doesn't know any of the new paths needed for the indicators which provide 
custom icons, so it just reports the default icon theme search paths. An 
icon_paths_changed signal is emitted which invokes 
menu::Manager::Impl::IconPathsChanged that sets the search paths for the 
default GTK icon theme (which is a global shared resource of the process).
After unlocking the screen no signal is sent to recover the proper search 
paths, so some indicators shows the missing icon.
Maybe a better way to handle this whole indicators icon thing would be to have 
a different GTK icon theme object for each menu::Manager instance instead of 
modifying the global default icon theme?

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https://bugs.launchpad.net/bugs/1635625

Title:
  Some indicator icons are missing after unlocking the screen

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