A big Thank you to Dexter Thomas for helping us find a solution to the missing autogen.bgl files. Here's what you need to do in order to rectify any problems with missing autogen files like the buildings at "Nina's Landing"
On the Acceleration DVD, search for the file scenery8.cab.
Open the cabinet file with winzip etc and look for scenery.global.scenery_autogen.bgl
Copy it to a Temp Folder and Rename it to autogen.bgl.
Copy the renamed file to FSX\Scenery\Global\Scenery and overwrite the existing autogen.bgl
Don't know how this works out for our friends that don't have Acceleration DVD. But maybe it's the same process for FSX pre-Acceleration??
Brad