I don’t have any project in particular where I use this, but I have created a test project where the issue is recreated on my installation. The attached image shows what I see in the node editor for the uber material in the attached project. The issue is that the Noise node is not functioning. It does not preview properly, and it does not show in the final render of the object with the material applied. I have this issue with similar nodes as well, however there are too many to list, so the noise node is included as an example (I assume that whatever is breaking the noise node is also breaking the others.)
I am suspicious that this issue is with my installation or system configuration, and not with my actual project. If someone could try loading this into their R25 version and see if the noise works or not, that would narrow it down to whether or not it is a system issue.
Recently, I have also encountered an issue where some of the nodes that *do* work periodically do not. When I import the nodes from another project where they are working into one where they are not, they resume functioning, as if the program “remembers” how they work. I have replicated this so far with just the Image node.