I am wondering why some scenery, for example Latin VFR MIA v2, will appear black the load back into their normal look. Is this something I can solve or something I may have to live with. I have tried searching but have come up empty, I have a feeling I may be using the wrong search terms however.

I have this same problem. But it is usually with AI aircraft. But also it is sometimes objects at airports. When I am looking down at my cockpit then look up, there are a bunch of black textures which have to take a couple of seconds to load.