Hey,
what I want to ask is are you required to somehow unlock gathering nodes other than have required level in corresponding DoL.

I am Miner @ lvl 38 but I can't see level 40 mining nodes in these locations:
Western Thanalan - http://xivdb.com/?maps/42/w1f1-00/Th...stern-Thanalan
Easter Thanalan - http://xivdb.com/?maps/44/w1f3-00/Th...stern-Thanalan

However I can see level mining nodes in South Shroud just fine.