Hi yet again :-)
OK looks as if you have nailed the problem. Moved all your scenery to just below AES Base.
Started FS up at LSGG and all buildings appeared - moved to KORD, all ok - moved to KJFK, all ok - moved back to LSGG, buildings gone only jettys showing (Possible time out came into play).
Herein probably the wrong assumption on my behalf. As I expected that on time out, the scenery would go back to default scenery.
Anyhow shut down FS - reactivated AES - Started FS at LSGG - buildings re-appeared - waited for time out,whereupon the buildings vanished but the jettys remained and FS did not freeze as before.
As for :- This wasn't so apparent from your message, which seemed as if the problem started with Geneva, and was eventually fixed by reinstalling AES. However, on the next message, you said the following, about KORD/KJFK:
ref my first post on this thread :-).
It has been a long battle, but looks as if finally got it sorted - will now attempt to make LSGG a permanent fixture. Then try a few flights to/from there. Will be back if any more problems arise, lets hope not.
Regards JohnT
Thanks for the effort to sort this out.