Hi Doug,
I think your problem comes from the fact that you have now two versions of the same plane. The folder nammed "Spartan" is certainly the old version, in FS9 format. The folder nammed "FSNW_Spartan_E" is the new version, in FSX SP2 native format.
Since the newest version is a rebuilt of the old one, there's a chance that the names specified in the aicraft.cfg are exactely the same as the names of the FS9 one. The solution has been provided by Hagar, you need to edit the aircraft.cfg of the FSNW Spartan to give it a new name.
The FSNW version has only one variant if I remember correctly, the original golden one. I don't know if the repaints from the FS9 version would work... probably not. But having this plane displayed without a single bug (no canopy problems, no prop hidding behind the clouds etc...) is definitely worth it
