I Can connect Mac OS Lion to Win 7 via cable but not via wireless...help! I have a macbook pro, and netgear n600 modem/router (DGND3700) and a win7 PC that is working nicely with homegroup networking.

when I plug the macbook into the router via a network cable I can 'connect to server...' and get the the win7 shares just fine. but when I try whilst using wireless it refuses to connect.

What should I tweak to make it work? I assume its a problem with the mac because other non-mac computers can see the shares on my win7 box just fine via wireless.
When i connect on a 2.6Ghz range rather than 5Ghz it works. so its probably that the netgear router (or the macbook) is not supporting ipv6 properly on the 5Ghz range.