I wonder why we have some people reporting that rings catch sheets and some do not.
You ring catchers, is it possible you are using a spring type ring (Just 1.5 wraps of wire) instead of the split ring type (like a key chain)?
The spring type I could see how you could just pull it with a pliers and it would pull out.
The split ring type, how do you get them off quick? I doubt if a pliers would work easily especially in the dark.