If you're having some problems with your new Lightning cable getting stuck in your Mac or PC, you are not alone. According to a CNET report, a growing number of iPhone 5 users are complaining that the USB part of the cable is difficult to remove from their desktop or laptop USB port. In some cases, iPhone 5 owners have traveled to the Genius bar in order to have the cable forcibly removed from their computer.
Apple support forum member Nclose took a close look at the USB end of the Lightning cable and noticed that the bottom notches, which hold the cable in the USB port, are deeper than the notches on previous iPhone sync cables. It's possible that these notches on the Lightning cable are too deep and allow the tabs inside the USB port to grip extra tightly onto the cable.
Apple is reportedly "aware of the problem" and is offering replacement cables to customers who are affected by this issue.