I've discovered mysterious lines running east-west across my strat map. They seem to be showing up everywhere but are only visible over near-black terrains or against the backdrop of the edge of the map. Pictures below.
Spoiler Alert, click show to read:
I know for a fact that I never had this issue with my old PC (and old monitor) but I don't know if this problem is due to my new PC (or monitor) or if I've induced it somehow in the last couple months when I started to notice it (got the new PC almost a year ago). Has anyone seen this before?