The only thing I did was create a new line of dialogue and attach it to an NPC. I did nothing else. For most people it seems to function properly, so I don't know what could be causing your problem.
That's pretty much all I did too, and I got nothing back. So that's by no means a solution to anything.
If I leave my silent voice files in place, everything works as intended with those NPCs.
Also I'm not sure who all reported this, I know I didn't because I was sort of hoping to see a CK update, which doesn't appear to be forthcoming. I guess it's time to prod.