I'm posting the solution to my problem should anyone encounter the same dumb problem. It appears I had left in my code a line that changed the root scene node every frame. I think the particles may be reinitialized when the root scene node is changed, so the particles never got beyond the first frame. I just changed to change the root scene node only if an actual change took place, and it works. It was on my todo list, but didn't think it would be relevant.
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