I dropped back to FW 4.6, and it appears to be running fine. I couldn't go very far back, as I forget when Async/Await was added to the framework. 4.6 seemed reasonable, and so far it does appear to be.

I'm still curious as to why 4.8 was not allowed when it clearly WAS already present. I'm also curious as to why the development system said that OLE4.0 was not installed when the FW version had no issues with it.