@Casette

once it is set to "0" it will reset it self every time from "1" back to zero in Poser 9 ! so to fix this issue make your change and set it as LIBRARY_IS_AIR 1 , after this step save, right click the Poser.ini, in Property change the value to write Protected, run poser and the library will work. Shut down Poser and take the hook off the write Protection of the Poser.ini now you can start Poser again and it will always load with Air.

you also might want to make sure that the Flash library "Dead version" is already floating and Not embedded in Poser 9 . as you do not have the text line in the Poser9 ini