OK, I solved the issue.

To explain:

It was from this manual (I was getting the same error in Gnome/Display settings):
http://askubuntu.com/questions/126392/problem-connecting-multiple-monitors-on-12-04-problema-al-conectar-monitores-ub

But creating virtual area and the xorg.conf file seems to have solved the issue.

Virtual 4096 4096 to the Display Subsection of my /etc/X11/xorg.conf:

     SubSection "Display"
            Virtual         4096 4096
            Viewport   0 0
            Depth     24
    EndSubSection

Kind regards,
Jan

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