Bent a CMI block this week, the one that's good up to 5/8"s 28000 breaking strength. I beleive a rope ran across it and opened it? We had just had a 400-500pd piece of fir on it and the rigging line was coming back up and sounded funny going through the block so I checked it out. Open and bent, barely clinging to the strap. Scary, and lucky. A good reminder to be constantly checking things throughout the whole process, not just at set-up.