I have noticed over the last few weeks running "AeroScenery" in both image providers that on some of the tiles level 9 and some level 11 files are missing. I thought at first it was a problem with the downloaded images, its not.
I went back to downloading a similar area of Finland using the old "FSET" and "GeoConvert" to find that generated all of the level 9 and 11 files perfectly OK.
My only conclusion from this rightly or wrongly is the problem lies within the "AeroScenery" software?