Okay, to clarify my original post's apparent "position," I want to stress that just because I made the suggestion that users not install Parallels 13, I was actually aware that my problems didn't necessarily implicate Parallels, far from it. Only that with the new Mac OS, problems were surfacing. I'm having a much better experience currently, with Parallels at v.13.0.1, and macOS 10.13.1 (beta). I'm also fully aware (despite evidence to the contrary) that we've always been warned against installing beta software (especially the OS) on a production machine. In my own defense, I'm semi-retired and my Mac was not involved in any "production" then, or in the foreseeable future, when I decided to participate in the developers beta program from Apple. But a project, for a professional friend and client, popped up a few weeks into the ongoing beta program. That's on me.
At the same time, I'm running Windows 7 Ultimate, mainly for reasons not at all associated in any way with the "production" nature of my overall setup. Also, I've been in close touch with higher-level Apple support, and they are fully aware of problems with what's known as "clamshell mode" on many users running the beta, AND public, releases of High Sierra. Theses issues apparently extend to many users who aren't using clamshell mode, but ARE using a wide variety of external monitors (chiefly in conjunction with latest-version MacBook Pro models. And of course, wouldn't you know it, that would include me.
I've actually had very few issues with Parallels, over the years. But High Sierra has made Parallels usage rather sketchy in my experience. That's really all I can say, or add, about this discussion. I'll keep up with comments, as I am very curious as to how many of other people's issues fade away when Apple releases a serious "fix-it" update to 10.13. Thanks all!
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