As Aerosim Classics are payware, doubtful if Aerosim textures contain corrupt textures (reversed flags) (although not impossible), so assume that liveries in question were downloaded from somewhere (Avsim???) - would suggest getting in touch with texture author outlining your problem.
In most of the new textures available on Avsim it does state that they will only work on a/c from Aerosim Classics Volume 2. I assume you have this?.
Like all good computer operators, you would obviously back up any folders/files that you were going to amend???
One of the many reasons for the liveries not showing is that you amended the texture, saved it and omitted to save it in Extended BMP format.
You could address your problem to Aerosim and get a rollicking for amending their textures with insufficient knowledge to carry it out.... or you could go to the Aerosim Support Forum in Avsim - here -
http://forums.avsim.net/dcboard.php?az=set_sort_key&forum=238&page=6¶m=author_name