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I just checked again and seems the cover is showing fine, did you fix it? also did you install the 3rd party storage? because I see the URL of the images is coming from cloudfront not from your own server.
its only fine because i had to manually upload it to my members.
create a new user and you will see there is only a message on the top left: "no cover"
yes, i use cloudfront but i use it all the time.