Monsters stopped spawning on my server. They only spawns after reload or restart, but once they get killed by players, they wont respawn. Please help. [INFO] Plugins: TreeAssist, FoundDiamonds, MinecraftViewer, AuthMe, iConomy, CensorIt, PermissionsBukkit, Essentials, Prefixer, Vault, NoCheat, LagMeter, Ptweaks, Reservations, CommandBook, Factions, WormholeXTreme, ScrollingMenuSign, Heroes, WorldBorder, Fortification, WorldGuard, WorldEdit, Jobs, ColorMe Those are my plugins list.