I now have firmware 4.80 working!
Apologies for panic.
It turns out that a contour map from BBBike.org was blocking other maps
on 4.80.
I thought that I had tried disabling it in my tests, but I have now
removed it. The start of the file contains these strings:
GB_mainland_contours
u, BBBike.org 19-Jul-2016 19:05
The "SMC contours" contours map is working properly.
Sorry for the noise, but maybe this might help someone else.
ael
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