Well, it wasn't a problem until this scenery...
Doens't mean much. Are you having this problem with a clean FS9 installation with this scenery only and with a default aircraft ?
If yes, then we might have a case. If not, and you have many other addons, you might get an error just becasue you were (for example, in case of memory exhaustion) *already* close to memory exhaustion and, by adding this scenery, which is not small, you crossed the border between having the problem or not.
If you had installed this scenery first, and then another addon, you might have thought the problem was caused by the other one, instead.
Can you check, for example (using Task manager), the total memory allocation at JFK, using the addons you normally use ?