Quote - I noticed the same thing, so you're not alone :) It is a bit annoying having to go into a different room, apply the material pose, then walk back.

Material pose? Or material? Or material collection?

A single material file (mt5) cannot be applied by double clicking.  You must drag the material and drop it on a prop or figure in the preview window, so Poser knows which material group to load it into.

A material collection or a mat pose file is supposed to apply to the selected figure by double clicking, or apply to any figure or prop by drag and drop.

The drag and drop sometimes must be done sort of deliberately, not a casual swipe. Sometimes it seems to not register the first time. A second attempt usually works.

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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)