I would also search your C: volume for any other copies of Poser.ini which could be giving you issues. I hope some of this may help.

I found some left over from old Poser installations,and I renamed them as Poser.nin

Anthony, try running notpad.exe as administrator and making the changes doing that. The AppData folder does include some MS Security.

Same effect (with Notepad and with Wordpad) as with editing in normal mode, i.e. Poser 10 crashed out, and LIBRARY_IS_AIR went back to value 0.

Other than that you may wish to search the registry for a reference to "LIBRARY_IS_AIR" to see if something is changing it there.

The only find (using Regedit) was in:

HKEY_LOCAL_MACHINE / SYSTEM / WPA / HKEY_LOCAL_MACHINE/SYSTEM/WPA/8DEC0AF1-0341-4b93-85CD-72606C2DF94C-7P-14

(where / (unless between spaces) should be backslash.)

no name, type REG_BINARY, value = a long sequence of 2-digit hexadecimal byte codes.