awesomeo_5000 linked me to this little program: http://www.reddit.com/r/Minecraft/comments/kc1d4/xp_orbs_broke_your_map_made_a_quick_tool_to_fix_it/ So I downloaded the map backup from the server, let the program remove all the orbs, and loaded the map back up. Also applied the jj.class thing in the minecraft_server.jar but we'll see if it works. PVP is back on.