I installed tons of mods this afternoon, and everything was going fine. I went into a random cave, and all of a sudden my magicka regen was through the friggin roof, I literally couldn't run out of mana. My channeled heal spell (the most basic one) didn't cost any mana all of a sudden, and when I would conjure my Frost Atronach or my bound battleaxe my mana would be back to 100% in about 2 seconds. I went through my active effects, and the only thing that seemed out of place was "fortify magic +25," but would 25 really make it this drastic?
(NOTE: The "magicka regen" on the screenshot is a mere 40% from my enchanted plate armor-- so that's not it)