When I load a new airplane, in the selection window, the thumnails don't match the airplanes. The text does, but not the picture. However, when I filter by type, i.e. Boeing, the thumbnails match. Any ideas to get them to match in "all"

I assume that this error only apply to your none default FSX aircraft. You could use the Autothumbnail utility by Lamont Clark to create custom thumbnails for your add on aircraft. Search the avsim file library for the file autothumbnail2.zip.Ulf B