When performing sanity checks before sending out targeted email campaigns, we often find that we may lose one or two contacts from that list.
However, it takes ages for them to fall off of the active list that we intend to use for that email.
The workaround is currently to edit the criteria of the active list by adding in a random filter, then removing it causing the list to refresh and drop those off that no longer meet the original criteria.
It would be so much better to add a "Refresh" option in the actions toolbar at the top right of the page.