xfce-4.1.91 & Virtual screen

Mon Nov 1 21:27:32 CET 2004

Hi,
In Xorg config of my FC2 box, I have:
--------------------------------------------------------
Section "Screen"
    Identifier "Screen0"
    Device     "Videocard0"
    Monitor    "Monitor0"
    DefaultDepth     24
    SubSection "Display"
        Viewport   0 0
        Depth     24    
        Modes    "1152x864" "1024x768" "800x600" "640x480"
        Virtual 1600 1200
    EndSubSection
EndSection
----------------------------------------------------------
When I run Xfce-4.1.91 I loss my Virtual screen 1600x1200.
With old version of Xfce (4.0.x), there is no such problem.

Any idea for fix this problem?

TIA,
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