Hi, as the title states, a large quantity of our boards have suddenly lost their background picture, this is an issue as we have A LOT of boards with similar names, so the pictures are used to quickly differentiate between boards. The pictures we used were from Unsplash.
I've checked the activity of a handful of affected boards to determine that there is no activity for the background change - If a background change is done manually there will be an activity stating "[Name] changed the background of this board"
As you can see below, it's not all pictures that are gone, but a large quantity. My best guess would be that this is a licensing issue between Atlassian and Unsplash causing certain pictures to suddenly become unavailable?

Issue is present across a handful of PCs, browsers and is also present in the Trello iOS app - Have not come across a single device that did not have the issue.