mplayer projector problems with Fedora

Hello, I have had problems using a projector under Fedora. For most applications, when I plug the projector into my laptop (DELL Latitude 610) the screen is echoed reasonably, but a strip at the edge of the display is missing. Fiddling with the 'Display' and 'Screen Resolution' don't seem to help (and the dual head does nothing!). Shame, but not crucial. However, with mplayer 1.0rc2 (locally compiled) the -vo options xv and gl look fine on the laptop screen but give a 'blue screen' in their piece of the projected image. I have never seen that before. 'gl2' works, but is very slow and finally times out. Finally 'dga' (root!) shows a completely corrupt image, but the same on both screens. -x11 sort-of works, but it cannot be resized and is not very nice. Any ideas anyone? Bill