[zcaveman]

There is a ''secret'' setting on the Comcast Motorola DCT3412 HDTV converter box to turn on CC for HD. Turn the TV on and the converter box off. Go to the front panel of the converter box and press Menu. Arrow down to Closed Caption and press the right arrow to get the enabled tag. Service Selection should be CC1. I am still playing with the other settings. Arrow down and change Settings to USER and press Power to save the settings.

This is only for the HD stations. The others are set via your TV.

I sent you a private note if you want the rest of the settings.