Don't install Poser outside Program Files. If you do that, it is vulnerable to a virus. The point of UAC is to block any program from modifying any file in the Program Files - that is almost 100% of the time a virus. The tiny bit of other times, it is a content installer or it is Poser.

When you ran the PP 2012 installer, the default choice for locating the main runtime was not in Program Files. The first choice was "highly recommended" I believe. Yet you changed it, right?

The correct solution is to do what was suggested by the installer - let it put your main runtime in your data area.

My Poser Pro 2012 Content is in:

c:/Users/Ted/Documents/Poser Pro 2012 Content

And every program has no trouble to read and write this folder.

I have to tell you another bit of advice, though:

You are making a grave mistake installing or saving things in your main Poser library. There were reasons to do this long ago. There are no such reasons now.

If you use the main library as a dynamic content area that you are always adding to or changing, then you will waste time doing backups of a big pile of content that came from SM, and you will have a tougher time keeping track of what's what if you decide to re-install or do a system restore.

I keep all content made by me in a Bagginsbill library. Nothing goes in there but what I created or saved myself.

I keep SM content in the main runtime and nothing else. Doesn't matter where that is because I actually never ever want any changes to that one.

I keep Daz V4 content in an external runtime specifically for V4 and related figures. It's a large pile of stuff which I can disconnect from Poser if I'm not working with V4. That makes loading and searching for content quicker, since Poser can just ignore that whole pile of files, which is well into the thousands at this point.

None of my "dynamic" libraries are in Program Files so reading and writing them is no problem.

Before anybody says that Python scripts have to be in the main runtime, no they do not, unless they have hard-coded paths. The technology of Poser and Python does not force a dependency on location. If a script has such a requirement, it is because that author did something foolish. All the scripts I write have been running fine no matter where you keep them. I have some that are not even in a runtime structure of any kind.

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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)