Hi. We had a replacement Tivo box as a self-install, and most things seem to be working fine except for modifying the series link options from their default settings. If I try this in the menu the screen goes black freezes for a few seconds, screen flashes and then takes me to the top menu again. I can prioritise the order of shows, amend the default recording settings on the tivo and also change the series link through tv anywhere. However changing existing series settings doesn't seem to work. Does this require an engineer visit?