Yes, I tried removing and re-installing both ASPI and KProbe. Didn't try going back to 1.10 as 1.12 worked beautifully for me.
I'm still looking. Maybe I'll risk installing the new nForce drivers which I've been puttting off, because apparently they don't work properly and because my old ones (certified for my mb) have been flawless to this date.
Well, I was going to buy the 52327S drive anyway, so I'll get to see if this is a hardware fault or not :)