Roblox’s safety update is locking some users out of chat, deleting old messages and pushing frustrated players off-platform.

Kids are being identified as adults—and vice versa—on Roblox, while age-verified accounts are already being sold online.

In context: Roblox is a gaming platform with a massive audience of teens and younger players. Authorities worldwide have criticized the service as a potential grooming ground for predators, but the ...