For Protecting Chests I have found LockProtection works perfectly.
http://forums.bukkit.org/threads/sec-mech-admin-pixelsecurity-simple-block-protection-pets-and-villagers-included-1-3-r1-0.78331/
Also I want to add TekkitCustomizer to the incompatible list.
http://dev.bukkit.org/server-mods/tekkitcustomizer/files/12-1-5-2/