Hello,
I had the same issue on Samsung Galaxy Note 4. Its truth that use_flat3d=1 can avoid these lines. But setting this causes me another bug, which I did not have before (by use_flat3d=0): in 2D mode I can not smoothly zoom out too much. E.g. by zooming out to 200km distance per screen, It is causing 5-10 seconds lag (the larger distance, the longer lag). Tle lag is caused by many thin lines Igo draws over the screen:
Its mostly annoying, when creating a new (longer) route.
Tried more IGO versions, all the time the same. I am not using any skin.
Anyone can help?