I am getting this odd error, every time I try to change the master shader for any shading domain, on any model, in any file, including new ones.  Here is a screen shot.

Carrara 7? Save and open the file again... here helped a lot today too.

I tried.  It still does the same thing. argh........  I hope Daz gets the first patch ready soon.

Same thing happened to me. It went away after: close>open>and rebuilding the shader.

The shader is the stock Mahogany shader. Well, sort of.  I created a new master shader, and pulled the Mahogany shader into it to use as a base shader to work off of and modify.  I didn't even get to that point when I got the error.

That's when it happened to me, also. I dragged a preset shader into a new master shader. Then this error kept happening.

From where ar eyou dragging the shader? I dont have so probelms draging it from the Browser... but when I drag from the instance tab I always have this problem.

It happened to me when I had an object already shaded, opened the file, and dragged from the browser into the shader tree.