I too was going to post on this subject.
I just got this spell yesterday when I turned 18. (hoarfrost2) At that time my conjuration skill was about 5. I am now about 60% into level 19 and my conjuration skill is almost up to 100, I have cast it on every mob I have fought since then.
I am not sure that it can be fixed easily but it should get mentioned in the patch so folks are at least aware of it. I know it has happened in the past (rogue kick skill anyone?) but it may be one of those things we just have to gut out.
One thing I did was to kill lower mobs for faction and skinning while working on it. This way when it failed it wasn't such a big deal, I could just beat the mob to death.
Truly