I've created a simple blender file with a plane and a material assigned to it with a texture. I've then animated the 'offset' material mapping property of the texture. Finally, I put the 3d view into Material mode. When I play back the animation, the display in the 3D view is not updated to reflect the animating offset value. This makes it difficult to animate this property correctly, since you cannot get visual feedback during editing.
If you manually adjust the offset or manually adjust another property that causes the texture to update itself, then the 3d view updates to show the appropriate offset. Also, the correct texturing is shown for rendered images.
Blender version 2.75 (sub 0), branch b'master', commit date b'2015-07-07' b'14:56', hash b'c27589e', b''