Wrong position after screen resize

Hi,

I'm using plank in an ArchLinux/XFCE4 in a VMWare virtual machine. Everything works fine so far, but when I set the VM to full screen ("Enter fullscreen mode" button on button bar in VMWare Player) the position stays the same, meaning plank floats in the "middle" of the screen (depending on how big the difference is). I have to restart it manually for it to go back down to the border.
I realize this doesn't happen often on a "host installed" machine, but as a VM...
Is there anything I can do to get plank to change position when the screen changes?

BR Surrogard