Have you tried a different web browser -- maybe something like Firefox?
Have you tried downloading and installing the stand-alone Slingplayer software? (http://support.slingbox.com/go/windows-download-desktop-us)
Just some ideas...
I hope you get it working!
What I'm getting from your post, is that you're having problems watching from a remote location.
In this case, I would recommend to check the following link: