Running Orbx Vector I see cars like this
Turn Vector off and they go away. But I can't figure out which vector file to turn off (.off) to fix the problem and allow Vector to run.
I think it's clear the best chance to have this fixed, is asking Orbx. They surely know which files of their product you should turn off.
As a general rule, do you have KSDF installed on an higher layer in the Scenery Library ? If not, maybe because you installed OrbX after KSDF, uninstalling/reinstalling KSDF would place it on the highest layer in the Scenery Library.
Or, you can use the free "Lorby Prepar3D V4 Addon Organizer", here:
https://lorby-si.weebly.com/downloads.htmlTo rearrange scenery areas using the new add-on.xml method. If the problem doesn't get away with KSDF on the highest layer, then you must find which file from OrbX you'll have to remove.