Got the 921 installed, updated and activated. Did a DTV OTA channel scan and after some initial lock issues and several reboots I'm able to lock on everything broadcasting from Chicago except DT-52 (our ABC station). However, doing a manual 'Add DTV' for this channel the guide shows signal of 117-120, plus shows 52-1 as the channel but it still won't add it to the channel list. Also there are 2 other DT channels and their respective subchannels that are causing duplicate entries and I cannot remove them or tune them in WGN 75-1; 75-2 and WCIU 1-1. I've tried disconnecting the OTA antenna, rebooting and scanning, but even then these two anomalous OTA channels remain in the program guide...I'm running out of ideas here.