add-on Turbo Beaver flights don't load.

Hi,I downloaded from Avsim and installed the Beaver files for FsX, dh2x_fop and dh2x_n61. Nice planes, fly well in FsX but....I can't save the fligts.I create the flights, hit save, they appear in the saved flights list but they are not to be found in the Load-list.The procedure works fine with the default planes but not with the Beavers from Premier Aircraft Design.They think some of the properties of the saved flights might have been erased by FsX, they say they reload fine on their pc although sometimes a flight saved several days or weeks ago before will not load.Anybody with ideas to solve this problem??Hans van MoorselThe Netherlands