[SAS~CirX]

If it is a game issue, there are some other setting in your conf.ini you can look at.:

[il2]
this describes game

title=Il2-Sturmovik Forgotten Battles

hotkeys=HotKey game
this determines whether the game uses hotkeys that are assigned in control section of hardware section of game setup

[window]
this describes how windows displays the game on screen

width=1024
resolution width in pixels set in display properties settings tab in windows

height=768
resolution height in pixels set in display properties settings tab in windows

LCD native resolution not included as an option in FB/AEP/PF Enter your screen values here and Save and start your game.... (if you later open the IL-2 Setup and close it by clicking OK it will change the resolution to 640x480 16bit, unless you change it to something else via this IL-2 Setup.) You will need the following values as well

change SaveAspect=0
ChangeScreenRes=1
EnableResize=0

ColourBits=32
resolution colour set in display properties settings tab in windows. Can be 16 or 32

DepthBits=24
Z buffer usage can be 16 or 24

StencilBits=0
Set in driver section of Il2FB hardware setup. Can be 0 or 8

All the above deal with image quality. The higher the numbers for width and height then the more pixels will be used in the same area therefore the image will be more detailed. The larger the number of bits then the more detail there is per pixel so better image quality

ChangeScreenRes=1
allows the screen resolution to be changed in game. Can be 0 or 1

FullScreen=1
forces display to be full screen and not in a window. Can be 0 or 1

DrawIfNotFocused=0
setting to 1 allows watching the IL2 window in the background, while Alt-Tabbing out of the game. Quite useful for playing co-ops - if you crash and wait for the next mission to start, you can put IL-2 in the background and keep an eye on the mission progress, but at the same time start ranting about "my fav plane is porked" on the forums.

EnableResize=0
Enables user to change window size. can be 0 or 1
must be 0 to allow lcds to fill screen

EnableClose=1

SaveAspect=1
Forces 4:3 picture aspect. Can be 0 or 1
Change SaveAspect=1 to SaveAspect=0 will remove some small black bars at the top and bottom of the screen you get without it on lcds

Use3Renders=0
Allows use of up to 3 screens. Can be 0 or 1

Otherwise it might be an issue with the application cotrolling your graphicks card (Nhancer, or Nividia Wiz or whatever)overiding your games graphic settings.

I have the same size screen and rez, here is my Conf ini settings, for reference:

[window]
width=1680
height=1050
ColourBits=32
DepthBits=24
StencilBits=8
ChangeScreenRes=1
FullScreen=1
DrawIfNotFocused=0
EnableResize=0
EnableClose=0
SaveAspect=0
Use3Renders=0