VPN PPTP Connects but doesn't work

Hello,

I'm new in mac...but last week when Im connected to my work by pptp VPN, i could not access to the resources of this network (servers, pc, etc.)...but few weeks ago I can do it as ussual. I didnt install anythink and if I send all packets to the vpn works, but i can't get internet..

I think some route preference change automatically but i don't how to fix it. any helps?

thanks in advance.

Regards,

Dario.