Sometimes the beads will crack, but this does not affect their ability to retain or absorb moisture. Keep at least 60% of your beads clear(moist). You can check the seal on your humidor a few ways. If its a solid top you can place a flashlight inside and look for light leaks around the edges. For glass tops take a crisp dollar bill and close the lid with the bill on the edge, if it pulls out easily that is your leak. You can also open the lid a few inches and drop, it should kind of whoosh closed and not slam. Painters tape on the edge will help seal the leaks.
