Hopefully an easy one...

I've got two SME 6.0.1-01 boxes connected over the net with an IPSEC tunnel using FreeS/WAN. Used several posts here - up and running in no time.
I was concerned about my remote PPTP users, but HAD to have the tunnel up...
To get both subnets seeing each other, I configured the IPSEC tunnel client with the address of our WINS server at the main campus. I also configured the Advanced Workgroup panel on each box with the WINS server at our main campus.
The tunnel works great, but my remote PPTP clients, after connecting, are unable to resolve all network hosts. Any address is pingable (both sides of the IPSEC tunnel), but only hosts manually added to the Hostnames panel will resolve, and only using the internal FQDN at that.
Before the IPSEC tunnel was in place, PPTP clients were able to resolve WINS and DNS hosts on the LAN using hostnames - no extra settings in the client VPN config.
After adding the IPSEC tunnel I'm forced to manually add a WINS server to the client VPN configuration. Once that address is in place, the client can resolve WINS hosts on both sides of the IPSEC tunnel.
My question is this: Is there a setting I've missed that is stopping my remote PPTP users from receiving the WINS server address when they connect?
Thanks!