navmesh bounds volume not working

trying to add a navmesh bounds volume but it is not showing (green) when i select navigation (p) from show menu
it is also a new ladscape with no landscape streaming proxies
i dont know whether it is due to this
i have now tried to scale the navmesh bounds volume with the brush settings and the scale settings
the message i see when i select show navigation is:

navdata count: 0
main navdata: none
using cluster links

this does not seem right

thanks