How do I get anisotropy to work in 2.72? I must be doing something wrong here, but for some reason in blender 2.72/2.72b the anisotropy shader is acting no different from a glossy shader.

Here is a comparison:


As you can see, there is no difference.  I have tried all distributions and tangents and adjusting the rotation to no avail.

Here are my nodes:  

I have not used any anisotropy since 2.72 came out and just opened up a simple scene I have not worked on for a while and noticed that none of the anisotropy is working as before.
Here is the scene I noticed it on:

The second render is the one I want.

Is anisotropy done differently in 2.72, or is this a bug?  I am inclined to think this is not a bug since somebody should have reported it by now, and one of the new things in 2.72 is the new Ashikhmin-Shirley distribution.
You need some roughness for the anisotropy to be visible. 



As I understand it, anisotropic shading simulates the way light reflects off objects with fine grooves like on CD/DVDs or machined cylindrical objects. Without any roughness, the surface is considered smooth (no grooves).