I noticed that there is an episode missing between 5 and 6. I tried to add a link but it didn't work, so here's how you can find it.
Go to veoh.com and search for Higher Ground Episode 9 (yes 9, I don't know why but it's the one missing) It explains, why Hannah isn't at Horizon anymore and should fill the gap.
Hope you enjoy the show. I'm loving it and Hayden is really great in it.