jredline,

What you're describing actually sounds like nothing to do with iris. It sounds like you started a new session of Poser and forgot to re-activate the parmatic Updater. If you find that all your parameter changes are ignored, then that's the problem. If you find that only iris changes are ignored then I'm mystified.

The Parmatic Updater must be run every time you start poser. 

Double clicking my shader automatically does that, but loading a scene where you double clicked the shader IN A PREVIOUS SESSION does not activate the updater.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)