THANK YOU!  

It's Windows Security. And this issue was caused by the "Controlled Folder Access". 

If that's ticked on, Windows blocks Poser. I listed Poser as an exception - and now everything works.

So for anyone else having this problem, the steps are:

Settings - Window Security - Virus & Threat protection settings - manage settings - scroll down to Controlled Folder Access - Manage controlled folder access - allow an app through controlled folder access (And if you had this error, Poser will be listed as recently blocked apps - just select it.)

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