When I try to read the guide book from Advanture's Amulate mod, the characters turn into wired black rectangles. I'm using the latest ehchiridion 2.0.1. I hope there is a way to fix it.
Here is a picture: http://i1.tietuku.com/072e7046103d7130.png

The issue is on Adventurer's Amulets side. Furthermore they have changed over to use Guide-API instead.

Same. I also downloaded the adventurer's amulets mod and find the letters of its guide book having black highlights. Here is a screenshot of mine.