Oh wow, I have been away from this forum - sleep and work, plus time zone differences.

I don't have any Poser 8 stuff in Program Files.
UAC is off.
I'll try turning Indexing Control off too.

I am now about to go and buy a second monitor (as a result of a recommendation by John at Smith Micro support). I hope to be able to watch processes and events on one monitor while having Poser open on the other.

I do think I am making progress though.
Since for other people firewalls and security programs seem to have interfered with the Poser 8 library,  I tried disabling ZoneAlarm firewall. I then discovered that it keeps resurfacing even if you disable it. So I have now completely uninstalled it and activated Windows firewall, and unblocked Poser 8 on that. So far so good, but the problem has been intermittent all along, so I don't expect it is completely solved yet.

Poser 11 Pro, Windows 10

Auxiliary Apps: Blender 2.79, Vue Complete 2016, Genetica 4 Pro, Gliftex 11 Pro, CorelDraw Suite X6, Comic Life 2, Project Dogwaffle Howler 8, Stitch Witch