Update:

The bug seams to be a problem with Unity 3D.

Using Unity 2D or Gnome Shell everything works fine: can use nvidia-
settings to change, add, remove monitors on the fly. Also the use of
disper is possible.

Addendum:

If I play arround with nvidia-settings (under Unity 3d) I can get twinview 
working the following way
-  moving the screens (see attached screenshot) together
- apply settings
- move screens side by side
- apply
- move the smaller screen on top / on bootom
- apply

Overall performance of 3d with nvidia 280.13 is poor (e.g. lt-Tab
switcher). That indeed is an indicator

 I am writing this under the Gnome-Shell environment, because Unity 3D
is not usable for me (crashes, Alt-Tab not working, cannot get minimised
windows back, performance really bad, ...).

** Attachment added: "Getting twinview working"
   
https://bugs.launchpad.net/ubuntu/+source/nvidia-settings/+bug/840462/+attachment/2363177/+files/Bildschirmfoto%20am%2006.09.2011%2C%2022%3A09%3A08.png

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https://bugs.launchpad.net/bugs/840462

Title:
  No Dualscreen-Twinview possible after Upgrade to nvidia-current 280.13

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