Thanks a lot Virtuali. I downloaded the new versions of both, Zurich and Geneva. After a fresh install of Zurich, I now see the buildings. With the previous version (1.3), Couatl was not installed. Now it is. Great compliments The scenery looks even more beautiful as in the previous version.
I really would download the (new?) JFK scenery too, but was not able to do so.
Anyway, thanks again for your quick help!!