Is it my receiver or is it something else? The closed captioning now does NOT work on any of the MPEG4 channels but it still works for my local OTA channels and the old MPEG2 HD channels. For example; I watched channel 73 and closed captioning works just fine but when going to the MPEG4 206, it doesn't. HDTH MPEG2 works but HDTH MPEG4 doesn't. What's up with that?