Ok 
, let’s try 2 last things:
1- In your General Options/Data, set Multiplayer to ON and in your Flight Conditions choose either All Players or Off in the Multiplayer section. Then restart the sim see if you have clouds now in the world map.
If not:
2- Try that workaround if not already tested: Live weather stops injecting after a certain duration flown / certain time flown - #324 by DementedCorn327