I have a spell with a magic effect, and this effect is correctly tied to the Restoration skill. It has a Base Cost equal to 3.0 and also a Skill Usage Mult equal to 1.0. However, this spell gives no experience to Restoration when used, no matter how high I set the Skill Usage Mult (even values such as 10000). The spell causes some health damage if this matters.

Really don't know what can be wrong. Anyone know what exactly is needed to make a spell give experience? What can I be missing here?

Only thing I can think of is that restoration spells that manipulate health directly, which are only heals, possibly levels up scaling with the magnitude healed. Since it damages health instead, this value is negative if I am not mistaken, and thus there is no experience gain because the coding reads it as doing nothing. I doubt that this is the case as I am pretty sure it should scale with the magicka cost but maybe something to check out. Software technology is weird like that.