Destruction, Illusion, Restoration, Illusion and Conjuration are all affected by something.
I have taken everything off, and disabled all mods (Imp's more complex needs, Hypothermia, IMCN overrides and Camping) so only the subsequent effects remain:
Fortify Barter - 3h 22m - Blessing of Zenithar
Fortify Magicka - Atronach
Fortify Magicka - Atronach
Muffle - 2m 43 - Muffle
Sailor's Repose - Sailor's Repose
Well Rested
This is baffling me. I don't understand why or how those schools of magic are affected. Any Ideas? I'd really like to carry on with my game here, but it almost feels like I'm cheating purely because I don't understand what's happening.
P.S. I can give you a savegame, maybe you'll know.