When you joined you might have been asked to install a Resource Pack. I know I know, resource packs, ew yuck gross. Let me Explain. We have tons of custom items, menus, GUI, music discs, etc etc. You need the resource pack to see these things. Some things in game wont make sense if you dont turn it on. Dont worry, its not that big and it wont wreck your experience. You can still use your own texture pack in conjunction (or vanilla textures too!). Turn it on, I promise it's worth it! resourcepack for help