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@jafauske 

I concur with your analysis.  It's my belief that the issue is with the Verizon servers.  For some reason it won't synch any messages that were received more recently than a week or two ago with the Windows app.  I've actually just tried the suggested steps and it had absolutely zero impact.  It did make Message+ ask me a list of preference questions as though it were newly installed, but that's it.  

As a workaround I've been using AirDroid, but it has some quirks, such as not receiving messages sent to multiple users (I believe that's because these are no longer handled as straightforward SMS, but rather Multi-media type messages).  Let me know if you find a free alternative that you like.