A smart list that filtered on Last Website Visit with a date, such as “less than 14 days ago” or “in the last 7 days”, could fail to load and show an error. This happened on teams whose contacts have a long history of tracked website activity, and it was most noticeable on lists that combine several filter groups.
These lists now load, and so do their counts on the Smart Lists page. The contacts in each list are the same as before.