Solved part of the problem -- explicit path to SumatraPDF.exe was
incorrect in the way I set it up.
So, I *can* manually point WinEdt 11.1 at Sumatra, but still don't know
why the 'alternative viewer buttons' are all greyed out (amongst other
things...).
Moreover, if I manually edit the path to the executable ("%H:\Program
Files\SumatraPDF\SumatraPDF.exe"), then Sumatra doesn't start as it
should. I get the following convoluted error popup, which I can't
easily interpret.
I must be missing something obvious somewhere. Thinks work fine if I
use the default WinEdt PDF viewer, but for a variety of reasons, I'd
prefer to work with Sumatra (or anything else I might want to try).
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