Aye man, I tried your fixes, and our maps broken still.
We are on a custom 2x2 with new islands, we
Cleared the map files in \ServerGrid
Added new files from Export map image and cell image and pasted to Grid
Cleared our caches
Restarted server
Everything above 2/3x
I ticked Grid and Water title on the map editor and disabled everything else.
The images inside the \Grid are 0,0 to 1,1 and WorldMapImage.jpg
Still fog of war.