I use the latest development version of Spigot. I am not sure if this bug is inherent to Minecraft itself, the bukkit code spigot is based off of or Spigot itself What happens sometimes is someone will place a block and the block does not get removed from their inventory and they are able to place it as many times as they want until they relog. The blocks placed are not ghost blocks. The person is able to mine them and pick them all back up again. These are my current plugins: 09:56:55 [INFO] Plugins (67): FireWorkArrows, Buycraft, Vault, dynmap, NeedTown, CombatLog, TeleportSuite, OpenInv, ProtocolLib, Votifier, mcMMO, PwnFilter, Cit izens, LinksOnSigns, NoMoreHunger, WorldEdit, JCVaultListener, NoCheatPlus, Town y, uHome, EpicEnchant, TagAPI, NameTags, VanishNoPacket, Stargate, PermissionsEx , PlayerHeads, Questioner, More-Mobs, Jail, EasyRules, boosCooldowns, DarkMythos , iConomy, CoreProtect, BookRules, Timeismoney, RedstoneClockDetector, ChunkSpaw nerLimiter, FirstJoinPlus, FalseBookCore, Herochat, WorldBorder, BlockHat, Sign Bank, CommandBook, DisguiseCraft, FalseBookExtra, Dynmap-Towny, MobArena, Blacks mith, FalseBookBlock, BattleTracker, FalseBook-IC, LWC, WorldGuard, BattlePunish ments, BuyRegion, pvparena, MobDisguisePVPControl, SilkSpawners, ChestShop, WGCu stomFlags, DeathTpPlus, WGPlayerDamageFlags, LWC-Economy, ecoCreature Has anyone else come across this? And I should note all my plugins are up to date.