Scenario: team member says they can't see any cards on a board.
My first thought: they have a filter enabled but don't realize it.
I don't have a proposed solution, but want to highlight that this is single-handedly the biggest usability issue my team runs into (other than understanding the "B" & "R" frame dynamics). I still have team members come to me months after they've been using Favro and I see in a screen share that they have a filter on and never knew it.