Is there any particular mesh setting needed?
Yes, there is, and it's mentioned on the manual. You need to be at least at 10 m/pixel. But I'm not sure it's a problem of the mesh.
Ok, I will check my mesh setting and see what happens. Anything else I need to double check? Only get this at this FSDT scenery and not the others.
BTW, I have KDFW on a higher layer than Mega Scenery Dallas.