1. What OS are you using (Brand and version - Ex. Windows XP SP3)? Ubuntu 10.10 64 bit. 2. What architecture is the OS you are running (x64 or x86)? 64 bit. 3. What version and architecture is your java install? (Type: java -version in command prompt.) java version "1.6.0_26" 4. Are you running any wrappers? McMyAdmin, mcadmin, Hamachi, etc? None, no-gui console. 5. What build of CraftBukkit are you running? (do NOT say latest. Say the build number.) Build The build number is displayed in the top of the server.log. 1572 6. What command are you using to run your CraftBukkit server? java -Xmx4G -Xms4G -jar craftbukkit-1.0.0-SNAPSHOT.jar 7. What plugins are you running? [INFO] Plugins: FalseBookBlock, FalseBookCore, PlgDisableCmd, ExactSpawn, ModTRS, BanHammer, PlgLogCmd, FalseBookIC, Lockette, CommandBook, iConomy, WorldEdit, RawcriticsOreObfuscationPluginSpout, HeroChat, StopTalkingAutoBan, Backup, WorldGuard, ControlTheExperience, FalseBookExtra, bPermissions, TimTheEnchanter, XcraftGate, NoCheat, VirtualChest, WorldBorder, HawkEye, Jail, ChestShop, OrebfuscatorSpoutBridge, Orebfuscator, ScriptBlock, HomeSpawnPlus, Permissions 8. What error are you getting (post your server.log file)? I've had this problem with a lot of builds already, but up untill now have not had trouble with it, or perhaps have unknowingly. When people type /op (theirname) or something else? on our server they just get op handed over to them, it mostly turns into a huge griefing and usually the banning of my staff. 9. What have you tried already? I've blocked the command by using PlgDisableCmd. I've made the ops.txt file unwritable. I've looked for plugins to remove operator completely. I've looked for similar threads. 10. Have you tried any of the things below? No, but its definitely not that (at least, thats what I think). Appearantly only some can do it. Im expecting with a hacked client? EDIT by Moderator: merged posts, please use the edit button instead of double posting.