I am currently testing this WRV200.
We have a PPTP server serving IP range from 126.96.36.199/24
There is no problem with the authentication and tunnel establishment.
Just that after the tunnel is established, the default gw in WRV200 is not pointing to the tunnel, but it's still pointing to the gateway on the WAN.
Since we have chosen the WAN type to be PPTP, the default gateway should be defined on the PPTP tunnel, isn't it?
Attached is some screenshot.