Try this...
When ABC first came out with the tv shows online I was addicted to lost and was thrilled to be able to watch while overseas in Israel. I assumed that they were going to check the IP of my machine and if it registered as out of US they would block me. It did, but then when I got back to the US I was also blocked. What I found out was that all it did was check the timezone that I had set windows to. Once I changed the timezone back from Israel to US it worked, ever overseas.
Try it, and let us know if that still works.