Although I am using the same photos as if my first proof, this time CreateSpace will not let me proceed because the photos are just under the desired minimum resolution. They look fine in the first proof. How can I make CreateSpace proceed?
Some ideas:
1) You could reupload your cover and resubmit your project and hope that the next human reviewer approves the cover; or
2) Use a graphics program to change the dpi of your photo so that it is actually 300 dpi rather than the "slightly less than 300 dpi"; or
3) Reduce the dimensions of the photo on your cover slightly so that the dpi increases to 300 dpi or more.