The null shader for some reason isn't producing any information as a child with my old cracks and tension shader, but if you take it out of the null shader it works fine. This used to work fine as a mask or child. :\
Also offtopic: can't edit topic titles. Says "hacking attempt..." and still getting 404s sometimes with the quick reply.
Oh, that's not a null shader, it's a displacement shader. Loaded the wrong damn clip. My bad. Sorry.