I find it quite interesting that you know such specific details of my issue and you claim no one else has ever reported it ?
And what this is supposed to mean ? Nobody reported it before for PHNL, but since all sceneries works the same way, I could present you the two different kind of stuttering (because you haven't described it accurately enough in your first message), in order to understand what's the problem in YOUR case.
I know the "specific details" of this issue, because I obviously know how the program works, and the object creation process is running at 4 seconds intervals, so if there are objects missing, the program would make a pause every 4 seconds, trying to create an object that is not installed.
Now, since (just to be sure), before replying to your message, I tried installing PHNL, and of course got no stuttering whatsoever, it's clear the problem must be on your system, because the installer surely won't forget to install files that are supposed to be there.
You can activate the Simconnect diagnostic mode to see what's wrong with your install:
Open notepad, and copy the following text:
[SimConnect]
level=normal
console=1
RedirectStdOutToConsole=1
OutputDebugString=1
; file=c:\simconnect%03u.log
; file_next_index=0
; file_max_index=9
Save the file as SIMCONNECT.INI in this folder:
Documents And Settings\YOUR LOGIN NAME\Documents\Microsoft Flight Simulator X Files
At the next FSX launch, you should see a text window with diagnostic message, that should tell what's going wrong. Hopefully, you should see an error message of some kind, every 4 seconds, when flying over PHNL.