One time... I recorded sport, now Tivo insists on suggesting sport of all sorts. I went through and gave two or three thumbs down to all sports that I did not like, but a few days later (seems to be after the next guide data download) back come the suggestions with no specified thumbs (and Tivo giving a predicted thumb up).
Repeated attempts at this have resulted in the same issue... any ideas?
Of possible interest (?) - I do reboot daily (around 3am) - not sure if that's important or not.