I'm on IWBUMS 35.22. Reading any vanilla books - metalworking, first aid etc. result with book disheartening and I'm not getting any skill boosts. Book shows as read and If I'm trying to read it again it just disappears..
Edit: If it helps - look like there are 2 sets of vanilla books in 35.22, with old icons and with new icons, I can find both for some reason and "old" books work, while new don't. Don't see "old" books if I play without hydro mod.
Edit2: Screen with old and new books http://imgur.com/K8RteGy