Here's another clue. I dumped the contents of the browser cache master control file, index.dat. It contains info about everything you've ever done, even if you clear the cache.

In it, I found tons of "LEAK" records that named the Poser files we're seeing. The LEAK record, as best as I've been able to research, means that the cache manager tried to delete the file, but couldn't, because some other program was using the file. That's pretty interesting, don't you think?

Poser is not using the file - it doesn't even know it exists. So some other program is holding it open. Something like, oh, I don't know, anti-malware filters?

I moved my temp folder to a new place, like you did dk3d, and since then I'm not getting any LEAK records and I'm not seeing any left-over files. What does that mean? I don't know yet but it's an interesting data point.

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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)