Thanks for posting to our Forums!I understand that you are having issue viewing the Slingbox in the US.
In this situation there is a lot that would cause this, I do see that the Slingbox show as out of date on the firmware version. Now to update the Slingbox it is best to be inside the location to update your unit. This is where I would start first.
Below is are some articles that will explain why it is best for waiting until you're at the home location to update the Slingbox and how to update the Slingbox
Hope this helps!
The Sling Media Moderation Team