Fog of war resets upon leaving and returning area

As title says, the fog of war is returning on the map even if I just port to town and sell then immediately return. It happens for all areas and zones. Also happens if I enter another adjacent area and immediately walk back through loading portal etc.

It didn't do this to begin with and seems to be after the latest patch. The mobs don't respawn, just the map becomes "unexplored" again which is a pain compared to how it was.

Not had anyone else mention this so far, doesn't appear to be a setting change (as I've not changed anything significant, a few gfx options to try and make it more playable / steady fps and yes I've tried reverting those settings but no fix).

Reinstalling the game will solve it, but this is obviously a bug, please fix it as soon as possible.

Thanks for the tip, reinstalling fixed the minimap reset for me too