Problem With Second Network

I have installed a VPN service which was detected by BD (IS 10 - 247) as a second physical network. A new profile, added to the default one, was consequently created.


Since that time, I've had problems: the primary profile network does not fully work (no way to access Internet via Firefox, while Thunderbirds works fine).


To solve the problem I have to connect to VPN (BD "sees" the network, as shown on the Firewall Status) then I have to disable it. At that point, the default network is re-established and again working (BD now "sees" the default connection).


Can you suggest me what to do to solve what seems the result of a network conflict ?


Thanks


mannaia