HDMI is a rather sophisticated system in which the device receiving the information must 'handshake' with the device sending the information. This can be as simple as synchronization or as complicated as sending back info concerning whether the device is authorized to receive the video in question (e.g. a TV set is OK, a recorder with HDMI input isn't). That's why the little red LED is on the device: it illuminates when the video is sync'ed up. And that always seems to work. Audio is a different question. Depending on the source and destination it may take more than one try to get the box to sync audio to the source. In these cases the picture comes through but no sound. By cycling the power or disconnecting and reconnecting the source one can eventually get the device to sync up and all is fine.
I have two of these boxes for widescreen TVs in different houses. They both usually sync right up to cable boxes, blue ray players etc but usually won't sync to a professional video recorder with HDMI output without the connect/disconnect cycle, or power cycle. Sometimes just starting and stopping playback will do it. In cases like this one doesn't know which manufacturer to point the finger at. The recorder people are looking at firmware to make their recorder sync to more HDMI sinks. The manufacturer of this little box could, presumably, modify his firmware to be more robust.
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