I have seen this effect when trying to replicate the P4 style MAT pose ability to change some material options without modifying others, such as changing a transparency level or diffuse colour without altering anything else. Any MAT file which uses the P4 material information (prior to the shader tree) will be interpreted as a simple P4 material and then be "translated" to a P5/6 shader tree, which will create new nodes for color_maps, etc. Unfortunately, in P5/6, this means it's impossible to create a MAT pose which only includes a change to a single value in a shader node as shader tree poses are assumed to be complete and replace any existing shader tree for the specified materials. There are python utilities out there (ShaderSpider is a good example, but P6 only IIRC) which can change node values through the python interface to the Material Room and the use of "partial" shaders. GeoffIX

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