[madcat]

I think its SaveAspect in your conf.ini, change it from 1 to 0

(from my conf.ini)

[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