We've created this Forum Thread with some workarounds and advice to assist you in publishing you ebook.
Print book covers.
Is anyone else having problems creating their book covers using the wizard? I am currently publishing a second edition of one of my novels, and all is okay until I try to review the cover. I have tried the old cover with the same results. It goes through the process, but does not complete the action. Having published twenty three print books, I am no rookie. If I have no joy, I will contact the admins, but just wondered if anyone else was having problems.