Thank you, Douglas, but I think I found the problem.
The official advice is that the Omega2 Pro can be updated using the web page but my experience is that this just doesn't work. The best thing to do is to follow the 'sticky' advice above about upgrading the firmware via the command line:
opkg update
opkg upgrade oupgrade
oupgrade
This then get's the whole board working properly ( in an omega sort of way, lol )
Thanks