I have a 1080p projector (Epson 1080UB). If I connect DVI to HDMI cable directly to it from my iMac 2.8GHz Core 2 Duo, it allows 1080p60. However, I have a 3x1 HDMI switcher. If I go through it, it only allows 1080i. Any ideas how I can force 1080p out. Do I have to use DisplayConfigX or SwitchResX?