Hi Gareth,
We are having similar issues just now, When applying some requests from the mailbox sometimes the text from that email is missing but the rest of the information is there from the rest of the trail.
We are also unable to reply from the mailbox with an option to show the email trail, the only way to have the email trail visible if by forwarding the email which is not ideal when you have to manually enter various different addresses. Not sure if these are currently being looked at.