I have confirmed that while the 921 new software (L145) does in fact generally improve the OTA tuner and prevent OTA tuner lock-ups, it does not help with issues experienced when trying to edit and maintain the local OTA channel list. This issue manifested itself in the original software, and continues to manifest itself in the new software as well (even after following the recommended smart card reboot procedure). As follows: 0) Start with an OTA database which has some minor issues, such as duplicate channels or confused PSIP information. In this example, this is from a DTV scan from the Chicago suburbs with some manual edits to add one or two things and remove one or two others. 1) Highlight and check all of the OTA channels in the list and then pick "Remove" on the right hand side to attempt to remove all of the OTA channels. 2) Observe that some of the channels are not removed when the other channels are removed. In this example, four channels appear to remain behind. These channels cannot be removed either as a group or individually, no matter how many times one tries. 3) Exit out of the OTA channel editing menu (saving the changes). Bring up the channel guide to see which OTA channels are available. Observe that some OTA channels are still displayed, but they are not the same channels which show up in the OTA list as ones which apparently could not be removed! E.g. If the four "stuck" channels looked to be 2-0, 50-1, 50-1 and 38-2 in the OTA channel editing menu, when viewing the guide, the "stuck" channels might be 1-1, 1-2, 75-1 and 75-2. 4) Go back into the OTA menu. Observe that now the "stuck" channels simply appear blank (no names or channel numbers at all). They cannot be removed at all. If one adds channels to the list, these "stuck" channels will take on the names of added channels (instead of being blank), but they can never be removed and will continue to show up in the guide (as 1-1, 1-2, 75-1 and 75-2 in this example).