webfiles.PNG is from the source PC, which behaved well in every respect except updating clientraw.txt. So client PC, Weather Display Live and Weather34 were not updating - they all showed 1623 data for the next 3 hours. There was no break in WUnderground data, however.
Unattended source PC runs Win 10 Home, so can’t network “properly”, but it connects to client PC (Win 10 Pro) with Microsoft Homegroup - effectively it shows as a mapped network drive - and client PC reads clientraw.txt directly. It’s been working well for some time. . .
Only recent change has been installation of a test weatherdisplay.exe to help with the real WD flat-lining problem. This time WD did not flat-line.