Dear Christian,
Here I can view several zoom level tiles in northern Germany, as attached. Note that I need to move the map after zoom, to "force" refresh of tiles.
As a test, did you try to add the lines as a map server instead overlay?
Here I can view several zoom level tiles in northern Germany, as attached. Note that I need to move the map after zoom, to "force" refresh of tiles.
As a test, did you try to add the lines as a map server instead overlay?