The first script was crashing with lights. Here is the updated version:

for actor in poser.Scene().Actors():
    mats = actor.Materials()
    if not mats:
        continue
    
    for mat in mats:
        for layer in mat.Layers():
            try:
                tree = layer.ShaderTree()
            except:
                continue
            for node in tree.Nodes():
                node.SetPreviewCollapsed(0)
            tree.UpdatePreview()

𝒫𝒽𝓎𝓁

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