Hm. When the Flash version is being used, the Flash engine is running inside Poser, part of the executable. So officially the new Flash engine should not be impacting Poser, but if it is buggy or something new is incompatible some hidden level of interaction, then messing up Poser is possible.

Given that the AIR version is working fine, it strongly indicates that there is some problem with the new Flash player.

Whether one or the other is better really is a personal preference. I like the AIR version better, because for me, with two screens, the undocked library in its own application window is better. With the embedded version, you can still undock it, but you can't independantly minimize or maximize the library window.

Other than the fact that it is a full-blown separate application window, there is no difference between the AIR version and the Flash version, in an functional or operational sense. In terms of resources (memory, CPU), I think they're about the same.

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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)