I am having the same problem, but it has only started recently.
The older pictures I have added to Cards remain in place. But ones I've added in the last few months (say 2 or 3 at a guess) stay for a few days then vanish.
To get them back, I click 'remove cover' followed by 'add cover', and then the pic returns for another few days.
The pics are important for the feel and the appeal of the Cards, so I would really appreciate a solution.
Thanks for your reply Charlotte.
It seems to have done the trick on Firefox. I was able to selectively delete cache in Preferences.
Safari 11.1 doesn't have this useful option. Instead you have to access the hidden 'Develop' function and then click 'Empty caches'. As soon as I did this, the Trello page and site completely disappeared. And I can't get it back! I've closed Safari, opened it again, put trello.com into the address bar, and the address comes up as a blank page...
I can still access Trello from Firefox, but not from Safari.
Unfortunately the cover pictures are still disappearing after a few days.
I wonder if it makes a difference if you save the picture to desktop first and then drag on to the board, or copy the image location/address into the 'Attachment' box?
I haven't tested this yet.
(I usually do the latter.)
If you had to thrive a new habit during a lockdown, what would it be? Trello
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