Hi, I have the same problem. I have no other software running, but when I install Geneva v1.4 the Error is the same as described (double lights and Runway markings - see Picture).
I tested also Geneva v1.3 and with this version the error is gone!
So, in my opinion the error is caused by the FsDt Geneva Scenery. So, if the error would be solved, I would by the Scenery.
Hopefully the error will be solved soon.
Best regards
Holger