Material Editor seems to be locked?

[noni 2]

I'm trying to edit a material and I'm finding that all the settings in the Material Editor are dimmed, so I'm unable to edit any of the settings.  I imagine it's something simple, but somehow I've not run into this before.  I'm attaching a capture of the window. Thank you for your help!

[bezo 647]

Looks like you´ve opened/enabled some SUBTAKE. Open Takes and check if you´re in MAIN take...

[noni 2]

That was it!  Thanks so much, bezo!  :)  See, these are the kinds of things that happen when you work without your glasses on  ;)