My Panasonic DMR-EX78 has now started to output recorded programs as 4:3 via HDMI (ie. the 16:9 picture has bars at the sides and above/below) , and the only way to get a watchable picture is to use scart and adjust the TV to "Zoom" ratio. When watching live TV using the Panasonic's tuner it outputs correctly via HDMI. I have checked that the aspect ratio is set to 16:9 (confirmed by the way live TV is OK) and have tried rebooting it by switching it off and on again at the mains. I have also swapped the HDMI input cables round at the TV end to check it isn't one of the HDMI inputs on the TV that is playing up. Before I make a warranty claim, please could you suggest if there is anything else I can try.