max. road-distance ... or ..?

came to a rather interesting surprise just now, roads dont show up on my map.

now I have a rather big map with currently only a few settlements and not even all have roads, but the one that have roads dont actually show them.

so I'm hoping I'm just missing something here like wrong grountype/climate, to large a distance between roads ...
any intel on the subject would be really apreciated as I'd love to set up my map with everything working as it should



on an unrelated side-note; am I correct in understanding that if I place 2 resources on the map in 1 region where 1 is mineable you'd also get a mine on the second resource when you build a mine for the actual mineable resource, eventhough the other resource might be like pottery?


Thanks in advance


G