I had the same problem as a previous reviewer. My photobook looked fine on three different computer monitors. Two PCs and one Apple macbook. When it arrived the pictures were darker and one picture that was taken in bright sunshine was very dark. I called customer service and sure enough they told me that my computer monitor settings were bright and because of the backlight all pictures appeared brighter than they would in print.
My brightness on 3 different computers was set to middle brightness. I took a picture of the book and they said yes it did print dark, but that's because the photo itself is dark. I told them it was not dark on the display of my DSLR and it was not dark on my computer. Yet they continued to tell me it was my fault. They told me to make the picture brighter on my computer and resubmit the book for a new order. However, I would have to pay shipping and taxes amounting to around $20! I told them I shouldn't have to pay for their error. And why should I need to brighten a picture that is fine.
I have had no problems with Shutterfly or My Publisher. It can't be a coincidence that other people have this problem. And also customer service was terrible. I asked to speak with a supervisor and was told he wasn't there, but would call me back within 72 hours. I never received a phone call.