I think I'm having this same problem -- I give the book to Storn, he stands up, talks with Frea a little while he walks to a new spot in front of the great hall, he says he's ready to read the book, then just stands there, looking around. I tried blasting him with Unrelenting Force to see if he was stuck, but no luck. Actually, I encountered a similar problem in this playthrough with Discerning the Transmundane when Septimus was supposed to read the book. Never had that particular problem before the Dragonborn DLC install, so I had guessed it was a conflict between the Dragonborn DLC and the mods I'm running, but if this fixes it, I'll be thrilled. I, too, would love it if you post a link to the .esm once it's up. Thanks for having the initiative to look into this and fix it!