WHY ARE MY CAKE POPS CRACKING?
The most common reason for cake pops cracking is due to sudden changes in temperature. When the cold pops hit the hot chocolate the cake can expand and cracking can occur. You might find that refrigerating rather than freezing cake balls helps minimize cracking. Also, letting your cake sit out for a few minutes after chilling and allowing your chocolate or melting candies to cool for a few minutes before dipping your cake balls can help.
The chocolate needs to be warm enough and thin enough to coat the balls smoothly and easily. The cake ball mixture needs to be cool enough so the pop holds together, but not so cool that it cracks. Finding this balance may take some experimenting.
You can repair cracks by dipping a toothpick in the melted chocolate, filling the crack with it and smoothing the crack out with your finger. You can also try redipping the cracked cake pops or covering the cracks with sprinkles, icing or other decorations.