Actually that's an expected result, let me guess you were using the default real world weather? What happens with the default weather engine is there are open areas in the cloud layers when the METAR is pulled from the internet. X-Plane tells both the default and SkyMAXX.....Hey don't draw clouds here. If you pull up the weather dialog you can see these open areas...... I was recommending NOAA plugin since the weather pulled has more consistent patterns and works better with SkyMAXX. But we are finding out that updates occur way to frequently which causes a pause in X-Plane. I guess a temporary solution would be to pull real world weather and switch back set weather uniformly without touching cloud layers, but to be honest I haven't tried this myself yet......