I guess changes to the map loading sequence caused the TerrainChanged
message to be sent before the map was switched from square to circular
instead of after. The pathfinder didn't notice the switch, so it
continued treating the map as if it were square, allowing units to walk
into the permanent map-corner SOD and vanish, and allowing territories
to expand into the SOD.
Tell the pathfinder explicitly when the map shape changes, so it can
discard its cached data correctly.
This was SVN commit r15277.
Ykkrosh
db39d742f0