It did the same thing for me, had two runes and used the fuction, had zero after that.
EDIT: Weird, exiting the game and re-entering and trying again got it to work, I went from 2 runes to 27.
[Edited by Aeterna85, 10/9/2012 7:49:24 PM]
Like I said though, this is easily avoidable if you just make sure you close the inventory before using the option. So I'm not sure it's worth trying to fix, this post is more for the benefit of people who may encounter this issue and come looking for a solution.
[Edited by poster55, 10/10/2012 11:21:35 AM]
firewall and other security software.
on trainer and game.
version and distribution.