I'm at work trying to type this on a tiny keyboard on my phone, so please bear with me...
Go to your:
C:\Users\username\AppData\Local\Frontier Developments\Elite Dangerous\Options\ folder, and remove the "Player" folder. This will force the game to reinstall the folder and all the files inside. That fixed the problem for me and a few other players.
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It looks cool SCing around with the orbit lines off, but I prefer them on as it lets see how the system is structured, and I always use the plane of the star system as a guide while approaching my destination. Hope this info helps.