Mass Effect 3 N7 edition. :( I ended up filing off the little prongs, and even then felt it was too "grippy" so i actually cut off part of the plastic.
I had similar issues with the ME3 steelbook. My solution was just to keep it in the case of whatever game I swapped it out for when I played something else. Just like an earlier poster, I now avoid steelbooks because of the bad experience with that one.