Hi Rod,
Many thanks for the tips. As I've done all the installations as recommended, I unchecked all my other non-relevant sceneries, and as you suggested, one of the other sceneries must have EZ and RWY12 content in them. The only one I was aware of was the EZ Library I was using for an Ice Pilots scenery pack I was using, but I had disabled that (as it is not P3Dv2 compatible). But it seems like another scenery or sceneries contain libraries. It's now a matter of hunting down the culprit.
Thanks again!