Q: Help with project upload from iPhoto?

Hi, I have tried numerous times to upload a photobook project from iPhoto to buy the book. I get all the way through to the last 'upload' stage, the 'assembling' works fine but then just takes ages to let me know it hasn't uploaded. I need to order it today, a bit last minute, but I have been trying all weekend to no avail. I have ordered fine from this before in the past, my iPhoto is the latest version and my internet is fine and connected at high speed. Can anyone shed any light on what to do? Thanks.