Created attachment 3436 Screenshot of both screens (cursor is at lower left corner-panel) I'm using a dualhead Xorg setup with two seperate screen (displays :0.0 and :0.1). xfce4-panel is executed on display 0.0 and it shows two panels (one on each display). If I now click on the panel on display 0.1 with the right mouse button, the drop-down menu appears in the middle of display 0.0 (see attachment).
Already fix in master, including another bunch of screen problems. There will be a new release tomorrow.