I got the Black Star a while back and decided to use it today. I killed a guard, trapping his soul in the star. This is the first soul that I have trapped in the star.
When I tried to recharge my weapon, the star didn't appear in the list of possible choices. After some experimenting, I figured out that, due to the Black Star's name, the star won't show up in the interface if you have three or more (other) black soul gems.
Any idea what I can do about this, besides dropping some black soul gems all the time?