my dual monitor setup broke

[Karsten Bolding <karsten@bolding-burchard.com>]

Hello

I've a nVidia Corporation NV43GL card and two monitors - 1900x1200 and
1280x1024.

I use xdm and icewm. When I get X up on the 1280x1024 screen I do:
export DISPLAY=:0.1
icewm &

It used to bring up icewm on the 1920x1200 monitor using the full space.
Now it only uses 1280x1024. I get this:
kbk@orca:~$ . ./duo 
kbk@orca:~$ IceWM: using /home/kbk/.icewm for private configuration files
IceWM: xinerama: heads=1
IceWM: xinerama: 0 +0+0 1280x1024
IceWM: xinerama: heads=1
IceWM: xinerama: 0 +0+0 1280x1024

I've tried to disable Xineramma in xorg.conf - did not help.

>From X.org.log I've:
(--) NVIDIA(1): DELL 2405FPW (DFP-0): 155.0 MHz maximum pixel clock
(--) NVIDIA(1): DELL 2405FPW (DFP-0): Internal Single Link TMDS
(II) NVIDIA(1): Assigned Display Device: DFP-0
(II) NVIDIA(1): Validated modes:
(II) NVIDIA(1):     "1920x1200"
(II) NVIDIA(1):     "1280x1024"
(II) NVIDIA(1): Virtual screen size determined to be 1920 x 1200

and further down:

(II) NVIDIA(1): Setting mode "1920x1200"
(II) NVIDIA(1): NVIDIA 3D Acceleration Architecture Initialized
(II) NVIDIA(1): Using the NVIDIA 2D acceleration architecture
(==) NVIDIA(1): Backing store disabled
(==) NVIDIA(1): Silken mouse enabled
(**) Option "dpms"
(**) NVIDIA(1): DPMS enabled


Anybody knows what can be the problem?

Karsten