simple problem with 2 monitors

[Alberto S�ez Torres]

 Hello. I've been loocking for any answer in the mailist, but I've no 
found any usefull data for my problem:

 I'm using a laptop with an nvidea, and I usually work with 2 monitors. 
(1024x768 and  other with 1280x1024) I use an extended Desktop: I have 
in my main monitor the taksbar, but I can move any window to any of the 
two monitors.

If I exec:

$ XWin.exe -multiwindow -multiplemonitors &

and call any X-application (xterm, by example) the window appears in the 
main monitor. But if I try to move it to the second monitor, I can't 
work with it (the window only shows a white rectangle)

 I've try with a lot of configurations (with -screen, with and wihtout 
-multiplemonitors and so on, but I can't get the solution.

 So... Can anyone help me?

 Thansk for your help.
                                                Alberto S�ez