What the heck is this horizontal line being drawn? Is there a fix for this?

 

 

No..that is something they fixed in MS Flight

I don't know what I'm talking about really, but I think the only 'fix' is to use a 'real-world' weather program which has 'work-arounds' for fog issues; I'm thinking of 'Open Clouds' here, which overlays a thin stratus layer on the fog, improving appearance.

 

It's payware but modestly priced, and works uninhibited with UK sceneries.

Its basically fixed if you use ASE or AS2012.