Snowblues - penguin - skill on wizard cant be used when its skilled at 1/5.
To fix the bug temporarily you have to get it to 2/5 t make it useful.
Although that only applies if you skill it from 0 straight to 2. If you have 1 point in it you have to use a skill reset scroll to get it to 0/5 so you can skill it straight to 2/5 else it wont work.