Chris, I am indeed running a 3 monitor setup, with the nvidia proprietary 
drives and Xinerama enabled.
I was beginning to suspect Xinerama, but had doubts since it was working ok on 
10.04.

First a little bit of history:
My multi-monitor setup has always given me trouble since I added the 3rd 
monitor. Two were always perfect with twinview.
When I added the 3rd, I had to switch to Xinerama because It was the only 
configuration I could make work. When I upgraded to 10.04 everything continued 
to work well, except for the occasional X crash, due to this bug 
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/570151.
Hoping to completely fix that bug I upgraded to 10.10RC because it had a newer 
version of Xserver. That bug seems to be fixed (I think), but now this QT bug 
appears. It seems that I will never get back a perfect running 3 monitor setup. 
:(
Multi-monitor configurations (3+) under Linux are very complex, hope someone 
can tackle this soon.

Any how, back to this bug, for the sake of testing I disabled Xinerama and 
indeed the problem went away.
Having Xinerama disabled is not a solution since it renders the whole 
multi-monitor setup pretty much useless. Not being able to drag windows from 
one monitor to another is simply not acceptable.
Not sure what changed from 10.04 to 10.10 that started this, so now I am not 
sure if this bug is a QT bug, a Xinerama Bug, an Xserver bug, or an 
Nvidia-Propietary drivers BUG.
Anyone can shed a light on this?

I am also attaching my xorg.conf file for documentation purposes and
hopefully for someone to review it.


** Attachment added: "xorg.conf"
   
https://bugs.launchpad.net/ubuntu/+bug/650539/+attachment/1671448/+files/xorg.conf

-- 
Launching QT apps such as SpeedCrunch, keepassX, Lucky Backup, Pencil, 
Stellarium, skype chrashes Xsever
https://bugs.launchpad.net/bugs/650539
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