I can't reedit my hair scalp particle system

I had Deflect emitter on. Turning it off solved the problem.

I’m following a tutorial here: https://www.youtube.com/watch?v=c2KO9svSdKU For some reason I can’t reselect my hair scalp particle system after I made another hair_eyebrow particle system. I was able to do this earlier, but I did something that is preventing me from doing it now. The hair goes into an uncombed status, and I can’t comb it back. Also, the material coloring is gone. Can someone tell me what I did wrong and how I can reedit my hair scalp particle system?

This is both hair_scalp and hair_brow particle systems working as expected. But I want to recomb the scalp hair.

But when I select the hair_scalp particle system, this is what happens:

Blend file: http://www.pasteall.org/blend/27916