For my Sorcerer Shadow Adept Archmage, wizardry works when I first acquire an item with wizardry, but after (apparently) resetting the server it doesn't work anymore. Wizards don't seem to have the issue since the spellslots generated by Wizardry are the same as regular ones, but the PRC spellbook doesn't usually recognize spellslots unless added with wizardry, to begin with.
Unequipping the items before reset and only equipping them after the restart and before resting fixes it.