I'm admin of my own server. The bug shows up when my character have an skill at level 0 and reads the any book of level intermediate and up using the admin power instant action. If they reads the beginners book recibes the corresponding boost. At level 2 of the skill stops reviving boost as usual but if they read the intermediate book recibes no boost at all. This is true for every level of skill book and every skill. I consistently try them all.