Hi James,
When you say you saw one for today then it disappeared, do you mean that it showed up and then vanished before the page finished loading? Would you be able to provide me with a copy of the error logs for that page? To get that log, right-click on the page and select "Inspect" then select the "Console" tab at the top of the view that opens up. You should see a "Filter" text area and to the right of that should be a menu with a down arrow that lets you choose "Errors". After you click that, just take a screenshot of everything listed in that view.