MongoDB 2.4.0 contains critical bug: https://jira.mongodb.org/browse/SERVER-9087 The bug can lead to data indexes corruption on secondary db nodes in replica set. The fixed release 2.4.1 is available/ Reproducible: Always
*mongodb-2.4.1 (25 Mar 2013) 25 Mar 2013; Ultrabug <ultrabug@gentoo.org> -mongodb-2.4.0.ebuild, +mongodb-2.4.1.ebuild: Version bump, drop bugged version, add kerberos support, fix #462606