I am having a similar issue. It developed recently. If I started up my computer and opened a browser, I used to be able to connect to the internet with VPN enabled. Now, I cannot. I must first connect to the internet with VPN disabled and subsequently I can connect VPN. Moreover, with some sites, such as GMail, Google Calendar, and Facebook, I frequently get disconnected when VPN is on. My only recourse is to disable VPN and refresh the pages with VPN off.