Hi, Would any library that carries Playaway Launchpads be willing to share how you get yours to lock? We use the standard device cases and for whatever reason the sliding mechanism won't cooperate, even after we replaced it with a brand new one. The company says we're the only library who has reported this problem, so I'm wondering what we're doing differently. Any help would be appreciated. Thanks! Emily -- Emily M. Dumas Library Director Royal Oak Public Library 248.246.3710