Wes, I found a way to "downgrade" the Premiere project file in question (created 30 days ago) so that Premiere CC 2017 will open it without any problems whatsoever. I am NOT touching my OS, because that will open up a whole 'nother can of worms. I will be working with Premiere CC 2017 for the time being. It's not the latest version, but at least it's stable.
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