Ok, I got it: when entering the compound node, for whatever reason, the node that exposes the outputs is located at a completely random location: something like (81, -2147483648)

I wrote this thingie to reset at a decent location both the Input and the output.
Seems to work with P11 and P12. It simply rearrange any compound node's Input and Output nodes.

x = y = 10
mat = poser.Scene().CurrentMaterial()
for node in mat.ShaderTree().Nodes():
    compound_data = node.CompoundData()
    if not compound_data: continue
    for item in compound_data.ExposedOutputs():
        compound_data.SetExposedInputsLocation(x+1000, y)
        compound_data.SetExposedOutputsLocation(x, y)

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