I'm running Ubuntu 12.10 and am having the same issue with Textures. Single chest shows up fine, but plain double chests are invisible or show up with a variety of textures that looks like an image sheet of textures wrapping the whole chest. Creepers are normally invisible (extra annoying), sometimes just their head is visible. Skeletons and Zombies sometimes so up correctly other times with the same messed up texture that wraps the plain double chest.