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The main front to rear lighting loom runs along the left hand side of the car. There's a multi-plug behind the side trim in the passenger footwell, and possibly another one behind the passenger side boot lining. It might be worth checking these areas for signs of corrosion or loose connections.
Though if it happened when you changed another bulb, my money's on damage to the plug or the bulb holder. Is it possible to swap over the left and right bulb holders to test?
Also... possibly stating the obvious here... but have you checked that the new bulbs work in another position? It's unlikely but possible that the replacement bulbs you're using are faulty.
Currently in Horatio's garage:
2010 Laguna III Initiale.