Email updates don't show diff anymore

[Jost Novljan]

Hi, today all the emails with updates I'm subscribed to have stopped showing the changes that were made on the page.

Not sure why it's happened as I wasn't changing any settings. The emails for changes still arrive, but they look a bit broken and there is no diff visible that was there before - the red and green colors to indicate text that was added or deleted.

[Heather Hale]

If I go to my Confluence page, and click on "Page History", then select versions to compare, I see the red, green, and blue highlighted fields for the changes, but I don't even get emails for the changes, despite being signed up for them.