I was testing the token functionality in 1.6 when I ran across another bug (I think). In admin/user/user_badges/settings there is a setting for Default badge link URL. If you save something in that field but then go back and delete it and save, the change will not save.
Steps to reproduce.
- enter a default badge link URL
- delete the default badge link URL
The bug is that the original setting stays and cannot be deleted. I suppose this is not huge because I just went back to individual badge URLs and they always have a link. If I didn't want a link however, I would have to go into the database to delete that setting.