I never had any problems, used them for years. Still have some.
They were suppose to have slipped off of the powder charge and created a space between the bullet and the powder, as I was told.
Some people were loading the powder then the poly patch, then the ball and it was not seated firm in the patch and it would roll out and create a unsafe condation. Those were a couple of things I heard about them.
Mostly sound like they were being used in the wrong way and creating unsafe condations and you know what that means, the company has to step in and protect us. Before we sue them.