The villagers spawn properly and everything, but nothing happens when I right click them. If I hold shift and right click a trade menu comes up with a bunch of empty slots and paper in the bottom row saying "no more pages".

Looks like some mod is cancelling out what's supposed to happen when you right click a villager and replacing it with that menu. Whichever mod that paper belongs to, that's the issue. They really shouldn't be doing that.

Nothing I can do about this, unfortunately. :/