Hi there, I use a XDirectFB ( www.directfb.org) X11 version; to enable a tvout on the second head. I always ran XFCE3 on it because this worked fine. ( a lot of wm do not work properly with the modified X; gnome/kde/xfce3 do;) now, I installed XFCE4, but every time I move a window, the screen goes black until I stop moving it. all other operations are just "normal"