I have the exact same problem with NetworkManager, network-manager-pptp
and Ubuntu Hardy.

Problem summary:
NM creates bad routing entries, where all packages are forwarded to the VPN 
server as a gateway instead of the PPTP tunnel endpoint.

Funny thing is, if you correct the routing table by hand, e.g. "route
add default gw <tunnel_ep_IP>", it will work for a couple of requests,
but after a while the custom entry will be purged from the routing table
and you will have to enter it again... Plus, if you repeat this
procedure a couple of times, sooner or later the networking will break
down completely with the error message:

"SIOCADDRT: No such process"

only a restart of the NM process will fix this from there on. Looks to
me as if NM+PPTP is fundamentally broken in Ubuntu. I have heard reports
of it working flawlessly on SUSE and ZenWalk.

-- 
PPTP plugin for network manager sets wrong routing table entries
https://bugs.launchpad.net/bugs/113622
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