Someone mentioned earlier that there was no Models folder in the data/Scenery folder and that's because the Models folder is at data/Models at the same level as data/Scenery.
Much time was spent over the last couple hours with a monitor that I made the mistake of shutting off last night and today it would not turn back on. Oh well. Guess I'll hit a pawn shop or 3.
I tried to reproduce the issue. I was not successfull. I had realized that in my previous post above I had not remembered that I was using a different default scenery, the one for Scenery-v2.12 and not the 2.0 scenery that comes with the current FGdata download.
I re-pointed my scenery path to include the default KSFO. I turned on Rembrandt. I had done like Edward had said and renamed my FG_HOME directory and let FlightGear build a new one.
I verified that I had the latest FGdata available and with the exception of a couple things about copy-write and the latest update to the C172P, I had hacked in the change to the preferences.xml shown at the repo by hand. This means that I have the most up to date data/Scenery folder currently going. I allowed the nav-cache to build with this Scenery folder.
Making adjustments to rendering and Rembrandt I was not able to reproduce the "tents" as shown above.
It may be that the difference is the C172P which I have from the previous update to the default aircraft. Other than that I wish I could be more helpful with this. I suppose I could get all of the newest FGdata and another nightly build and try again. Maybe that will help one way or the other.
--Ray