Uhm, I'm not sure I understood what you did arnold, so I'll just go over the procedure and ask you if you did exactly what I'm describing:
1. Open the file "tgen.ini"
2. Find the line "[Render]"
3. DO NOT erase it or in any way change it.
Why - this line declares the beginning of a table with critical data (the lines below this line, until the next line with "[something]")...
4. Add a NEW line directly under the [Render] line, like so:
FullScreen=0
So... Now the render block will look like this:
[Render]
FullScreen=0
DeviceDetect=0
SoundDir=...
CockpitDir=...
3DObjectsDir=...
[Terrain]
5. Save the file, run USAF - and presto!
6. If it doesn't work - are you running some localized version which is not 1.02F?
Best regards to Rosanna...