Hello,
I just found out I have the exact same problem: I bought and installed KLAS yesterday, do I dont know if there's any link, but I cant have the PHNL scenery to display any longer.
I eventually moved the KLAS scenery under the PHNL scenery in the fs9 library, it doesnt help.
I tested all my other FSDT sceneries (LSZH, LSGG, KORD, KJFK), and they're all ok, only PHNL vanished. Any clues?
The addon manager menu indicates the product is activated, so I really have no idea what's causing this.