Video Podcasts won't delete

I have 2 video podcasts, both from CNET, that will not delete from my TiVo. After viewing and selecting delete, they still show on the podcasts list. However, now they won't play. If I try to play them I get the error message "Error playing a recording. The TiVo box was not able to record this program because there was no video signal on the channel. You may have been trying to record on a channel that you don't receive." I have deleted and re-deleted and re-booted and re-deleted. Nothing seems to make the two podcasts go away. I don't think it matters but the two podcasts are "Facebook test self-destructing posts" (irony) downloaded on Fri 9/12/14 and "Huawei does the Honors in CNET UK podcast" downloaded on Mon 11/10/14. I used to not care but, since this week is CES, CNET has added 65 1-minute videos and I can't use the "Play all shows in this group" function since the two troubled podcasts are the ones it tries to play first. Any ideas? Thanks.