Right, so I have this annoying problem with some mods (invasion, cctv) that I follow all the instructions, minecraft works normally, but the items/entities don't exist. Any idea on what the problem could be?
Try removing the WHOLE .minecraft folder. Backup your saves and achievements if you'd like to. Then Press force update in the launcher and re-install the mods. Make sure the mods work with Minecraft 1.1.