ok,figured out my problem i was having mate. it was my own custom scenery that i built and the runway material was not defined so it wasnt showing up on the world map!
The project was for a helipad too so i just set the runway size to be 1x1meter ,as a runway isnt nessesary, but i changed the runway dimensions to 5x5m,but i dont think this would be the cause of the problems,pretty sure it was the fact the runway surface material was undefined for some reason
hope yous get it sorted