I recently bought a Panasonic AJ-YAX800 encoder card to use with a HPX370 camera. Everything I've read from Panasonic says you can use this card with the 370 to record proxy video to a SD card. Even the menu in the 370 has the option to set up proxy video. However, when I I put the 800 card in the camera and turn it on, I get an INCOMPATIBLE CARD error. I called B&H and they said the card doesn't work with the 370 even though Panasonic says it does. I can't reach anyone at Panasonic. Anyone have any information on this? I want .mp4 proxy video that can be instantly put online. Any help is greatly appreciated.