AirVPN client has started borking Virgin Media(UK) router.

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This bizarre issue has cropped up for me only in the past couple of days - every time I launch the AVPN client, even when it appears to have connected to a server, my internet stops working. As far as Windows is concerned it's still connected to a network, it still recognises the router, but websites simply will not load. It stays non functional even if I disconnect, disable the network lock & close out the client, and the only way to get it working again is to reboot my PC and modem and let it run through its automatic diagnostic cycle a few times - the connection usually returns after 10 minutes or so.

Nothing whatsoever has changed - same hardware, same software, same cables, same settings.

Any ideas?