did you find any solution for your problem?
i have the same problem wifi client dont see internet …
EDIT : this may help some other people
Solved using Microsoft loopback adapter and then disabling tcp/ip v4 and v6 over the wan
more details http://timita.org/wordpress/2011/07/29/protect-your-windows-laptop-with-pfsense-and-virtualbox-part-1-preamble/
thx for him.