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I accidentally deleted a startup application in Luna which leaves me with a blank desktop without Plank or Slingshot at startup...
It must have been from the top of the list which is in alphabetical order, if that helps.
Any clues which one that could have been and how to get it back?
You've most likely removed cerbere which is the process that starts (and watches) desktop components like the panel, dock, and applications menu.
gnome-session-propertiescerbere