I purchased 5 of these about six months ago because I had more space in a file drawer than a bookshelf. At first, they were a lifesaver - I could file and update at will. Now, the rings on all 5 are impossible to open. The hanging hooks do not appear to interfere with the design - I have tried opening while the hanging hooks are in all possible positions - I don't know why these are now so hard to open. Now relegated to the archives. Will try another brand...