If I put my initial survey ship on a LONG auto-pilot course into unknown territory, the Fog of War on the main map is uncovered as the auto-pilot ship moves each turn, but the mini-map is not updated.
WORKAROUND: If you manually click the mini-map and zoom in (or zoom out) it will be redrawn with the Fog of War updated to be in-sync with the main map.
-Proud Canadian