I haven't read through the whole thread but I have searched and paged through most of it. I just got a LC-46D64U and love the TV, but there is a small quirk which I am not sure is normal. I set it up to tune Digital Cable to find unencrypted QAM channels provided by Time Warner, and it found like 200 or so channels which are mostly the encrypted digital cable channels, and I found some normal broadcast channels that are unencrypted.
This works as expected, but when I tune to an encrypted channel it seems like it kills the OSD on the TV. By that, I mean that there is no channel number after about half a second, and the menu button or any other doesn't work to get anything on the screen. The screen will be 100% blank until I dial in a channel manually, and it will jump to it and if it's unencrypted or analog the TV will be back to normal. If its encrypted, the OSD stays for about half a second and goes away. Is this supposed to happen? I have not tried the firmware update yet, I just had a little time to play with the TV and I will give it an additional effort after work today.