Hey Pete,
Did you know you can see a specific's contact journey in an automation by adding "&contact_id=[THE CONTACT'S ID]" to the end of the automation's URL?
This shows you WHERE the contact is currently sitting (if they're in the automation) and/or where they exited. As well as the steps they've ben on.
This also works in custom objects if you want to see where any specific object is inside the automation. Just make sure to ALSO use "&contact_id=[THE OBJECT'S ID]" at the end of the URL.
This has simplified my debugging TONS. Hope it helps.