I could kiss you Lux, that's EXACTLY what happened. I must've accidentally clicked it at some point the other day when I was actually trying to select the Face button, and didn't realize I had done so. This is the first time this has happened in all the years I've been playing in Blender, well at least since the new GUI came out with version 2.5x, so couldn't begin to imagine what I had done to cause it. The old 2.4x versions didn't have anything like this.

Now I'm also interested in the info in your first post, but I'm not sure where you're asking me to look, so if you could post a screenshot of that as well, I'd like to make note of it as well for the future.

Thanks again.

LuxXeon posted at 12:17PM Fri, 17 November 2017 - #4318136

Here's a screenshot of the option button in viewport. Make sure this is enabled.

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OK . . . Where's my chocolate?

Butterfly Dezignz