It's as is.... you unplugged your machine and took it to work, plugged it in there. So all the limitions of the LAN you VPN'd to are now in effect.
This is not a bug. There are no plans to change how this works as it would break the security of the VPN.
I have windows xp with default firewall enabled and by default my internet is working fine but with VPN connected, internet is not working.. very typical ..
Any help would be highly appreciated!!!