Created attachment 2561 
A manifestation of bigger screen being split

Hi,

I've encountered following problem when selected smaller (vertically smaller)
display to be primary (e.g. to be leftmost (0,0) one with xrandr).

A panel if moved to display one becomes invisible, and if moved to display 2 it
splits poor guy in two.

I've attached a screen-shot for latest occurrence.

$ xfwm4 --version
    This is xfwm4 version 4.6.1 (revision 29817) for Xfce 4.6.1
    Released under the terms of the GNU General Public License.
    Compiled against GTK+-2.16.1, using GTK+-2.16.1.

    Build configuration and supported features:
    - Startup notification support:                 Yes
    - XSync support:                                Yes
    - Render support:                               Yes
    - Xrandr support:                               Yes
    - Embedded compositor:                          Yes
    - KDE systray proxy (deprecated):               No