Active effects bug

[mynaisir]

I've looked over the Technical Support forum and haven't found anyone mention this problem before - if I've overlooked someone posting this problem before, I apologise.

 

My problem is this: Oblivion now treats all character active effects (for example: Breton character gets Fortify Magika and Resist Magic) as if they were spells and casts each every five seconds or so (although it does not cost me Magika - it is as if the game is casting spells on me, not me casting them on myself). The game is still playable, it's just quite irritating to be surrounded by spell effects all the time. Once I choose a birth sign, all of its active effects also got treated as repeating spells, so I've got five different spell effects each being cast every five seconds or so. The framerate takes a hit and the constant spell-casting noise is a distraction.

 

I suspect this problem has been caused by a mod, but as I have added quite a few recently, I thought I'd check here first to see if anyone else has encountered this problem before I go for a clean install and try to figure out which one is causing the problem via a process of elimination. Any help appreciated.