I was playing the main quest and I have an issue where, after getting Fred and reporting to Myr, I can't report to Duncan, even after loading and redoing the quest. There's also an issue where the meeting between the demon and Greg also doesn't play until after I load a save after getting Fred, so that might be causing it. 

Just tried the quest again where I kill Fred and it worked. So it's an issue with taking him in.

This should've been fixed in the latest patch

got it, thanks.