add a new channel from the channel store.
It will pop up a screen saying "adding channel"
when that screen goes away, press the left button to get back to the channel list.
then a new screen will pop up saying "channel added"
you are now unable to do anything else.
probably aware of this, but it's pretty annoying and I've been running into it for a while.
happens on all I think but this right now is on a R3.