I have a Display Port to HDMI dongle that I am plugging into a projector that has a native resolution of 1024 x 768. I change the resolution for the external display within display properties on my 11" MBA to 1024 x 768, but the projector (an Epson X10) is still 'seeing' a 1080p input, so the image being projected is surrounded by a black frame. The same happens in mirror mode and extend mode. Even if I change my MBA resolution to 1024 x 768 and mirror the external display as the same resolution, the output of the DisplayPort/HDMI still is recognized by the projector as 1080p. Has anybody else run into this problem and what is the solution? Thanks for the help.