Have you performed a hard reset of the Slingbox yet?
With the new router inplay, the Slingbox is required to go through the hard reset, then setting the unit back up again. The following article will let you know to perform a hard reset:
Once the hard reset is performed and the network light comes back on, you can then go to setup on slingbox.com to set your unit back up again. Then go into your router to verify everything is setup correctly.
Hope this helps!!!
Sling Media Moderation Team