Bug or Feature? Hair system, mesh and Density map

Hi guys

I have a problem with following a cgcookie Piero tutorial: http://cgcookie.com/blender/lessons/16-creating-the-feathers-part-01/

Everything goes great until I have to add a density map for one of the particle systems.
Basicly it goes nuts and cant be set. Everytime I click something, anything, its changing in unpredictable way.


The weird thing is that I have 2 particle systems and the first one works well.

You can try to reproduce it by:

  1. Create any mesh (box will be fine), and a small plane which will be a feather
  2. Create Particle System, change:
    a. from Emiter to Hair (Hair Length: 0.3 will do)
    b. Render --> Object --> Dupli Object: the plane mesh you created
    c. Textures --> click New
    d. having it selected go to Textures tab to Influence and click Density.

Now everytime you click something it should change. If the influence is Length it`s fine.

Is it a bug to report?

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