The behavior you describe is what you see when there is already a script running. The buttons seem to press and release but they don't do anything. However, in this condition, the Python Scripts menu also does nothing, and attempting to explicitly do File/Run Python Script also does nothing. However, Mungo ran my Wacro1.py file somehow to synchronize. Now it turns out that my Synchronize button is in fact Wacro1.py, but how did he run it?

If Poser is in a stuck state, and running scripts is not allowed, the buttons behave as you say. But then how did he run wacro1.py?

Mungo didn't say how he ran it.

Literally I need to know how he ran it.

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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)