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Not the all users have this problem. Most of the new users dealing with it. I checked to cronjobs and it seem to be working fine. Also when users changes their profile pictures they dont have any problem. There is someting wrong with cover photo.
I can replicate it by using "test" user. Because I can't replicate it with my local site, so i'm not sure this is valid bug. I need your FTP access detail for debugging purpose.
please edit your first post at this topic, and put it at site info form.
There is another problem with cover photo for groups. I have just created a new group with admin account and upload a new group cover photo. After that when I refresh the page and the cover photo turn to the default group cover photos.