Ah well Beery, don't let it spoil your fun, and if you're that upset, well have a crack at making the offending scenery (I've got a Nessie project under way at the moment, but on hold recently).
Unfortunately, if the problem is widespread, it will spoil my fun to a certain extent. I had hoped to fly up the Congo and Nile on an exploratory flight through Africa. If half of the Nile is missing, it will be more than an annoyance. The problem with creating the scenery for the missing areas is that the joy of discovery isn't there. When you find missing scenery and have to create it, finally flying over it has its positive side, but it's not the same joy as finding a new and unexpected scene for the first time.
Anyway, I guess I'm going to have to get involved in scenery creation. Does anyone know what the best program is for creating new buildings, etc.?