Don't know what's going on, but Houghton in the the Castle never asks me to do the Vahnatai Rescue mission. I all ready killed the Vahnatai before I got to the castle. Houghton give me the Vahnatai Sighting mission, I leave, come right back, tell him I completed the sighting mission. Then nothing happens. I've gone back to him a hundred times and it doesn't progress. Any suggestions?