That's great Kevin :).
Could you let us know what the issue was? For the benefit of the community so that if someone else faces such an issue, they have a direction to look in.
Many thanks, I was just going to post back here this evening.
After contacting engineering the issue has been resloved.
Apologies for the inconvenience.
This issue sounds like it would need to go to engineering for troubleshooting.
I'd suggest you raise a ticket with client care for this.
In fact all previously created In-App Messages from all apps are no longer accessible...