Red flag under "Banking" indicating a new transaction, what do I do?

When the "Accounts" column under "Banking" shows a red flag, indicating a new transaction(s), if I clicked on that account, the bottom of the page showed the new transaction and I accept it or assign it to an existing transaction. Now (last week or so), there's nothing there on the bottom of the page. If I click on the red flag, a box appears that says, "You have 1 transaction to review". If you click on the message, nothing happens. Did something change or did I accidentally turn off the review process? In other words, now I cannot get rid of the red flag next to the account. (Attached image)