1. What upload speed is your fios rated for? At the host slingbox location, go to a computer and run a speed test from www.speedtest.net choosing the closest server city; then post the results.
2. How do you have your directv receiver connected to your slingbox pro hd (what type of cable connection ,methos---"composite, svhs, component, etc). You need to have component video and audio cables connected to stream the device in hd.