Missing texture attribute
I'm a beginner in Maya and am having the following problem:
In the attribute editor for most of the objects in my scene, the texture/shader attribute is missing so I can't tweak any of the textures. So, although the object is visibly textured and I can find the texture in Hypershade, it isn't displayed as one of the attributes which causes some major problems. When I try tweaking the texture through Hypershade, the object to which the shader is assigned doesn't change.
Thank you for your help, in advance!