[ton414]

I also use a resolution of 1280 x 1024.
This part of your file "conf.ini" must be so:

[window]
width=1280
height=1024
ColourBits=32
DepthBits=24
StencilBits=8
ChangeScreenRes=1
FullScreen=1
DrawIfNotFocused=0
EnableResize=0
EnableClose=1
SaveAspect=0
Use3Renders=0