Yep, it takes a few hours for the To Do list to "find" and populate later episodes beyond the one you used to setup the series link. The one thing that putting the HR20 in standby does is allow the background processes to start right away. So if you just setup a bunch of series links before going to bed you can turn the unit "off" (puts it in standby) and by morning everything should be properly indexed and updated in the To Do list. I typically don't do this myself since we only watch TV in the evening so it's got all night and all day to index stuff.