Thank you for the really helpful suggestions.
However today, when I called up the blog, the photos have appeared so whatever was wrong has cleared itself. Obviously I am unable to follow your suggestions but I will save them for the next time it happens!
Aren’t I a pessimist(?) but I’ve been involved with electronics since 1954 so I am familiar with their inconsistency!
If it CAN go wrong – you can bet it WILL!