Right, I'm really frustrated that this has taken me so long to do, but I'm currently in my final year at University so have been rushing around trying to find time to get things done.
That said...
The issues with the maps not showing has now been fixed

Also, while I was there, I took the trouble to fix some other little bits which had been niggling me - now the map zooms to the photograph's date and we have an updated version of the map/timeline to play with.
Again, apologies for taking so long to get this fixed.