While what you suggested appears to make sense, it wound up not making a difference. I wonder if there is some more global location to set this. I can't even do what I would normally do manually, since the paste special function doesn't work at all. What really has me puzzled is that the borders of the cell do not change when I copy it to the clipboard. It is as if the clipboard doesn't recognize the data as an Excel cell.
De minimis example:
Further correction attempts have included rebooting the computer.
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