could it be a recent firmware upgrade to the Canon 5DII changed HDMI output format? Some time ago I was able to use a TV with HDMI input as external monitor to my EOS 5DII. I had firmware 2.0.8 installed then. Recently I changed to version 2.1.2 (+ ML 2.3 on one CF card) and since then the TV says "Unsupported video format" no matter with or without ML launched (tried with or without CF card, with or without ML and with removing battery for some minutes between tries). And of course I tried all ML settings I could think of... The TV is a Philips 32PFL5404H/12.